Climate Change Alert!!

Willamette Valley Wetland Mitigation / Conservation Banking and Other Data Driven Ecological Decision Making Tools

  •          1 Alder Creek

  •          2 Amazon Creek - Sold Out and / or Inactive

  •          3 Bobcat Marsh - Single User

  •          4 Butler

  •          5 Camas Swale - Inactive

  •          6 Coyote Prairie

  •          7 Dairy Creek - Inactive

  •          8 East Fork Minnow Creek - Inactive

  •          9 Evergreen Creek

  •          10 Fernhill - Sold Out and / or Inactive

  •          11 Foster Creek

  •          12 Frazier Creek - Sold Out and / or Inactive

  •          13 Garret Creek

  •          14 Half-Mile

  •          15 Linnton Mill

  •          16 Long-Tom

  •          17 Marion

  •          18 Mary's River

  •          19 Mid-Valley

  •          20 Mud-Slough

  •          21 Muddy Creek

  •          22 Oak Creek

  •          23 ODOT Greenhill - Single User

  •          24 One Horse Slough

  •          25 Oregon Trail - Inactive

  •          26 PGE Harborton - Inactive

  •          27 Rinearson

  •          28 Riverbend North - Inactive

  •          29 ODOT Santiam River - Single User - Inactive

  •          30 South Santiam River

  •          31 Tualatin Valley

  •          32 Weathers - Sold Out and Inactive

  •          33 West Eugene - Sold Out and / or Inactive



  • WVWMB
    1 / 33

    Alder Creek Wetland Mitigation Bank Site

  • Recovery Actions: 1. Remove sawmill facility and private berm, 2. Create a complex of habitats within the active channel margin (channels, marsh/mudflat, riparian) on the outboard side of the SIDIC levee, 3. Create upland forested habitat, 4. Install LWD in channels, 5. Protect and enhance existing habitat

    Completed: 1. Phase I Environmental Site Assessment, 2. Phase II Environmental Site Assessment, 3. Structural Hazardous Materials Assessment, 4. Preliminary Title Report and resolution of title matters, 5. Boundary survey, 6. Property Line Adjustments, 7. Topographic survey, 8. Geotechnical Assessment, 9. Cultural Resources Survey and Report, 10. Wetland Delineation (draft), 11. Biological Assessment (draft) 12. Sediment and Erosion Control Plan In Progress, 13. Biological Resources Report (summer 2012), 14. Rare plant survey report (summer 2012), 15. Hydraulic and Hydrologic Assessment (summer 2012), 16. Wetland Functional Assessment (summer 2012)

  • Benefits to Salmonids from the Alder Creek Project: 1. Rearing habitat, 2. Foraging habitat, 3. Cover from prey, 4. Food production, 5. Shaded water (reduced temperatures), 6. Habitat complexity (LWD), and 7. Diversity of habitat

  • Purchase Price Range: $85,000 - $125,000 per DSAY (Credit)

  • Sponsor
  • Wildlands

  • Contacts
  • Julie Mentzer: Director of Environmental Ops, 503-241-4895 (office), jmentzer@wildlandsinc.com
  • Mark Heintz: COO and General Counsel, 916-435-3555 (office), mheintz@wildlandsinc.com

  • 2 / 33

    Amazon Creek Wetland Mitigation Bank Site

  • Phase 1 Mitigation Bank Instrument
  • Phase 2 Mitigation Bank Instrument

  • Amazon Creek Phase 2 2011 Monitoring Report
  • Amazon Creek Phase 1 and 2 2009 Monitoring Report
  • Amazon Creek Phase 1 and 2 2008 Monitoring Report

  • 3 / 33

    Bobcat Marsh Wetland Mitigation Bank Site

  • Mitigation Bank Instrument
  • Mitigation Bank Long Term Management Plan

  • Bobcat Marsh Wetland Mitigation Bank As Built Report
  • Bobcat Marsh Wetland Mitigation Bank 2012 Monitoring Report
  • Bobcat Marsh Wetland Mitigation Bank 2013 Monitoring Report
  • Bobcat Marsh Wetland Mitigation Bank 2014 Monitoring Report
  • Bobcat Marsh Wetland Mitigation Bank 2015 Monitoring Report
  • Bobcat Marsh Wetland Mitigation Bank 2016 Monitoring Report
  • Bobcat Marsh Wetland Mitigation Bank 2017 Monitoring Report Letter

  • 4 / 33

    Butler Wetland Mitigation Bank Site

  • Final Mitigation Bank Instrument
  • Revised Final Mitigation Bank Instrumen

  • Butler Wetland Mitigation Bank 2013 Monitoring Report
  • Butler Wetland Mitigation Bank 2014 Monitoring Report
  • Butler Wetland Mitigation Bank 2015 Monitoring Report
  • Butler Wetland Mitigation Bank 2016 Monitoring Report
  • Butler Wetland Mitigation Bank 2017 Monitoring Report
  • Butler Wetland Mitigation Bank 2018 Monitoring Report
  • Butler Wetland Mitigation Bank 2019 Monitoring Report

  • 5 / 33

    Camas Swale Wetland Mitigation Bank Site

    6 / 33

    Coyote Prairie North Wetland Mitigation Bank Site

  • Coyote Prairie North 2011 Mitigation Bank Instrument
  • Coyote Prairie North 2015 As Built Report
  • Coyote Prairie North 2015 Long Term Management Plan

  • 2009 Coyote Prairie Phase 3 Vernal Pool As-Built Report
  • Coyote Prairie North 2009 - 2011 Annual Monitoring Report
  • Coyote Prairie North 2012 Annual Monitoring Report
  • Coyote Prairie North 2013 Annual Monitoring Report
  • Coyote Prairie North 2016 Annual Monitoring Report
  • Coyote Prairie North 2017 Annual Monitoring Report
  • Coyote Prairie North 2018 Annual Monitoring Report

  • 7 / 33

    Dairy Creek Wetland Mitigation Bank Site

  • Dairy Creek Prospectus

  • 8 / 33

    East Fork Minnow Creek Wetland Mitigation Bank Site

    9 / 33

    Evergreen Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument
  • Mitigation Bank Conservation Easement

  • Evergreen Creek Wetland Mitigation Bank 2007 Monitoring Data for Target PFO and PSS Management Units
  • Evergreen Creek Wetland Mitigation Bank 2009 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2010 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2011 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2012 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2013 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2014 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2015 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2016 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2017 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2018 Monitoring Reportt
  • Evergreen Creek Wetland Mitigation Bank 2019 Monitoring Reportt

  • 10 / 33

    Fernhill Wetland Mitigation Bank Site

  • Mitigation Bank Instrument
  • Mitigation Bank Instrument Appendixes

  • Fernhill Wetland Mitigation Bank 2007 Monitoring Report
  • Fernhill Wetland Mitigation Bank 2008 Monitoring Report
  • Fernhill Wetland Mitigation Bank 2009 Monitoring Report

  • 11 / 33

    Foster Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Foster Creek Wetland Mitigation Bank 2009 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2010 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2011 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2012 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2013 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2014 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2015 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2016 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2017 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2018 Monitoring Report
  • Foster Creek Wetland Mitigation Bank 2019 Monitoring Report

  • 12/ 33

    Frazier Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • As-Built Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2009 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2010 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2012 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2013 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2014 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2016 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2017 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2018 Monitoring Report
  • Frazier Creek Wetland Mitigation Bank 2019 Final Monitoring Report

  • 13/ 33

    Garret Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Garret Creek Wetland Mitigation Bank 2009 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2010 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2011 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2012 Monitoring Report Letter
  • Garret Creek Wetland Mitigation Bank 2013 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2014 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2015 Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2016Monitoring Report
  • Garret Creek Wetland Mitigation Bank 2017 Monitoring Report

  • 14/ 33

    Half-Mile Creek / Wetland Fee-In-Lieu Mitigation Bank Site

  • In-Lieu-Fee Instrument

  • Half-Mile Fee-In-Lieu Wetland Mitigation Bank 2012 Monitoring Report
  • Half-Mile Fee-In-Lieu Wetland Mitigation Bank 2013 Monitoring Report
  • Half-Mile Fee-In-Lieu Wetland Mitigation Bank 2014 Monitoring Report
  • Half-Mile Fee-In-Lieu Wetland Mitigation Bank 2015 Monitoring Report

  • 15/ 33

    Linnton Mill Mitigation Bank Site

  • Goal: Provide high quality habitat for salmon, lamprey, mink, bald eagle, osprey, and other native fish and wildlife living in this otherwise heavily developed stretch of the Willamette River
  • Recovery Actions: 1. Removal of multiple buildings, 2 docks, and 700 pilings, 2. Restoring access for salmon, lamprey, and other fish to a section of Linnton Creek (currently confined to a pipe), 3. Planting thousands of native plants across the site, 3. Removing invasive vegetation and laying back the banks along the Willamette River to improve riparian and shallow water habitat for fish and wildlife, 4. Placing logs in the creek for small fish to hide, rock piles in the uplands for mink to den, and snags for bald eagles and other birds to perch and hunt

  • Sponsor
  • RestorCap

  • Contacts
  • https://www.restorcap.com/services/

  • 16/ 33

    Long-Tom Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Long Tom Wetland Mitigation Bank 2009 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2010 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2011 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2012 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2013 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2014 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2015 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2016 Monitoring Report
  • Long Tom Wetland Mitigation Bank 2017 Monitoring Report

  • 17/ 33

    Marion Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Marion Wetland Mitigation Bank 2009 Monitoring Report
  • Marion Wetland Mitigation Bank 2010 Monitoring Report
  • Marion Wetland Mitigation Bank 2011 Monitoring Report
  • Marion Wetland Mitigation Bank 2012 Monitoring Report
  • Marion Wetland Mitigation Bank 2013 Monitoring Report
  • Marion Wetland Mitigation Bank 2014 Monitoring Report
  • Marion Wetland Mitigation Bank 2015 Monitoring Report
  • Marion Wetland Mitigation Bank 2016 Monitoring Report
  • Marion Wetland Mitigation Bank 2017 Monitoring Report
  • Marion Wetland Mitigation Bank 2018 Monitoring Report
  • Marion Wetland Mitigation Bank 2019 Monitoring Report

  • 18/ 33

    Mary's River Wetland Mitigation Bank Site

  • Mitigation Bank Instrument


  • 19/ 33

    Mid-Valley Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Mid-Valley Wetland Mitigation Bank 2006 Phase 2 As-Built Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2007 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2009 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2009 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2010 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2010 Phase 1 Monitoring Report Additions
  • Mid-Valley Wetland Mitigation Bank 2011 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2011 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2012 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2012 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2013 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2013 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2014 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2014 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2015 Phase 1 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2015 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2017 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2018 Phase 2 Monitoring Report
  • Mid-Valley Wetland Mitigation Bank 2019 Phase 2 Monitoring Report

  • 20/ 33

    Mud-Slough Wetland Mitigation Bank Site

  • Mitigation Bank Instrument - Phase 1
  • Mitigation Bank Instrument - Phase 3
  • Mitigation Bank Instrument - Phase 4

  • Mud Slough Wetland Mitigation Bank 2009 Phase 1 and 2 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2009 Phase 3 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2010 Phase 3 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2011 Phase 3 and 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2012 Phase 3 and 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2013 Phase 2 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2013 Phase 3 and 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2014 Phase 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2015 Phase 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2016 Phase 3 and 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 20017 Phase 3 and 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2018 Phase 4 Monitoring Report
  • Mud Slough Wetland Mitigation Bank 2019 Phase 4 Monitoring Report

  • 21/ 33

    Muddy Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • 2008 Monitoring Data Generated Predicted Weed Surface

  • Muddy Creek Wetland Mitigation Bank 2008 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2009 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2010 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2011 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2012 Phase 1 and 2 As-Built Report
  • Muddy Creek Wetland Mitigation Bank 2012 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2013 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2014 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2015 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2015 Phase 2 As-Built Report
  • Muddy Creek Wetland Mitigation Bank 2016 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2017 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2018 Monitoring Report
  • Muddy Creek Wetland Mitigation Bank 2019 Monitoring Report

  • 22/ 33

    Oak Creek Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Oak Creek Wetland Mitigation Bank 2009 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2010 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2011 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2012 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2013 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2014 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2015 Monitoring Report
  • Oak Creek Wetland Mitigation Bank 2016 Monitoring Report
  • 23/ 33

    ODOT Greenhill Wetland Mitigation Bank Site

  • ODOT 2015 Greenhill Mitigation Bank Instrument
  • ODOT 2015 Greenhill Mitigation Bank Deed Restriction

  • ODOT 2017 Greenhill Mitigation Bank Annual Monitoring Report
  • ODOT 2018 Greenhill Mitigation Bank Annual Monitoring Report
  • ODOT 2019 Greenhill Mitigation Bank Annual Monitoring Report
  • 24/ 33

    One Horse Slough Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • One Horse Slough Wetland Mitigation Bank 2009 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2010 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2011 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2012 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2013 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2014 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2015 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2016 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2017 Monitoring Report
  • One Horse Slough Wetland Mitigation Bank 2018 Monitoring Report
  • 25/ 33

    Oregon Trail Heritage Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • 26/ 33

    PGE Harborton

  • TBD – IN PROGRESS

  • 27/ 33

    Rinearson Creek

  • Recovery Actions: 1. Removing an earthen dam that blocked salmon, lamprey, and other fish from swimming up Rinearson Creek, 2. Reducing the size of the pond to cool water temperatures while maintaining habitat for western pond turtles, 3. Planting thousands of native plants and removing invasive vegetation throughout the project area, 4. Placing large wood in the stream for small fish to hide, rock piles in the uplands for mink to den, and snags for bald eagles and other birds to perch and hunt, 5. Protecting the site from human disturbance by only allowing recreational access on defined trails

  • Sponsor
  • Falling Springs

  • Contact
  • https://www.fallingspringsllc.com/rinearson-natural-area-restoration-project

  • 28/ 33

    Riverbend North Wetland Mitigation Bank Site

    29/ 33

    ODOT Santiam River Wetland Mitigation Bank Site

    30/ 33

    South Santiam River Wetland Mitigation Bank Site

  • South Santiam River Wetland Mitigation Bank As-Built Reort

  • South Santiam River Wetland Mitigation Bank 2020 Monitoring Report

  • 31/ 33

    Tualatin Valley Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Tualatin Valley Wetland Mitigation Bank 2012 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2013 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2014 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2015 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2016 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2017 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2018 Monitoring Report
  • Tualatin Valley Wetland Mitigation Bank 2019 Monitoring Report
  • 32/ 33

    Weathers Wetland Mitigation Bank Site

  • Mitigation Bank Instrument

  • Weathers Wetland Mitigation Bank 2008 Monitoring Report
  • Weathers Wetland Mitigation Bank 2009 Monitoring Report
  • 33/ 33

    West Eugene Area Wetland Mitigation Bank Site

  • West Eugene Wetland Mitigation Bank 1995 Memorandum of Agreement

  • West Eugene Wetland Mitigation Bank 2002 Annual Report
  • West Eugene Wetland Mitigation Bank 2003 Annual Report
  • West Eugene Wetland Mitigation Bank 2004 Annual Report
  • West Eugene Wetland Mitigation Bank 2005 Annual Report
  • West Eugene Wetland Mitigation Bank 2005 Annual Monitoring Report

  • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

    Development Debit and Compensatory Mitigation Credit Transactions

    To determine net mitigation credit remaining and its credit dollar value from a debit/credit transaction, enter the information requested in each of the boxes below and press the calculate button.

    Mitigation Debit / Credit Transactions
    Development Acres:
    Mitigation Acres:
    Development Multiplier:
    Mitigation Divider:
    Price Per Credit:



    Calculator Interpretation

    Development Acres

    This is the amount of acreage of a given natural resource type (e.g., frequent emergent wetland, wetgrass prairie, vernal pool, snowy plover breeding habitat, etc.) that will be converted to alternative uses (e.g., housing sub-divisions, shopping malls, highway interchanges, etc).

    Mitigation Acres

    This is the amount of acreage of a given parcel of land (often degraded farm land or open space) that will be converted to alternative uses (e.g., frequent emergent wetland, wetgrass prairie, vernal pool, snowy plover breeding habitat, etc.) to off-set the loss of the same or similar resources somewhere else.

    Development Multiplier

    This is an assigned number often representing the relative importance of a particular resource type. Resources assigned high importance values are assumed to require a proportionally greater number of acres to compensate for their loss. Factors that can affect the assignment of resource value include but are not limited to: 1) scarcity in the landscape relative to historical extent, 2) time periods required to reach a fully functioning condition, 3) importance to focal concerns (e.g., imperiled species, watershed TMDLs, aesthetic and recreational opportunity, 4) the relative capability of a habitat unit to provide life-cycle requirements for a species, etc.). The acreage of a given development site multiplied by its assigned development multiplier equals the amount of debit accrued by the development action and the amount of credit needed from the mitigation site to off-set the debit.

    Development Multiplier Values
    High: 4 Medium-High: 3 Medium: 2 Low: 1
    Back to Top

    If the development site is equal to 10-acres and the Development Multiplier is 2, then the number of debits is 20 (10 x 2).

    It should be noted here that mitigation "ratios" are often derived directly from ranking comparisons between development sites and compensatory mitigation sites.

    For example if the relative value of the development site is 3 and the relative value of the mitigation site is 2, then the ratio applied to the mitigation action is 3/2 or 1.5:1. Under this principle it is also possible (and hopefully probable) that the development site may be lower value than the mitigation site after the mitigation action is complete and meeting its performance objectives. For example, if the relative value of the development site is 2 and the relative value of the mitigation site is 3, then the ratio aplied to the mitigation action is 2/3 or 0.67:1. Since ratios of < 1 result in a net loss of natural resource acres, many regulatory agencies have taken the option of imposing a minimum compensatory mitigation ratio of 1 (also represented as 1:1).

    It is my intent that future versions of this web site will be connected to a relational database management system (RDMS), possibly Microsoft SQL Server, that will contain data, run queries, and generate reports that reflect known field conditions measured against both performance standard criteria and functional assessment criteria and which will in turn be used to inform compensatory mitigation ratios and to model compensatory mitigation outcomes.

    Mitigation Divider

    This is an assigned number often representing the relative likelihood of mitigation success depending on the compensatory mitigation method(s) employed. Methods that have a low track record of failure are generally assigned low mitigation dividers and those with a demonstrated high risk of failure are typically given higher mitigation dividers. Also compensatory mitigation methods that result in 100% loss of resource acreage are often assigned higher mitigation dividers. The acreage of a given mitigation site divided by its assigned mitigation divider equals the amount of credit available at that mitigation site.

    Mitigation Divider Values
    High: 4 Medium-High: 3 Medium: 2 Low: 1

    If the mitigation site is equal to 10-acres and the mitigation divider is 2, then the number of credits available is 5 (10 / 2).

    Price Per Credit

    The "price per credit" is generally a free-market determined decision often based on the sale prices of credits in the general area being "serviced" by a mitigation site. Factors such as the monetary cost of producing a credit (e.g., costs of land acquisition, site-preparation, maintenance, long-term endowments, etc.) combined with the prices of credits from competing mitigation providers have a relatively large influence on the price a credit is sold for. These prices tend to vary temporally and spatially depending on such factors as supply and demand, the strength of the economy, and proximity to major metropolitan areas.

    Service Area

    The geographic area (e.g., species recovery unit or watershed) surrounding a conservation or mitigation bank where species and/or regulated aquatic resource debits (i.e., development actions) may be accrued against the credits generated by the conservation or mitigation bank

    View Willamette Valley Mitigation Banks

    Note: A good way to use this web map application is to first make sure the area of interest is included in the extent (top to bottom and sides) of the map area you are viewing and that you have opened the attribute table (icon on the far left). Then click on the tab of the bank you are interested in and highlight it by clicking on the gray bar left of the far left column. Next, double click on the record to zoom into the bank boundaries. Repeat these steps for the service areas (SA) of the respective banks of interest. You may want to clear your selections before moving on to the next bank of interest. If you want to see where a proposed project is located in relation to a given bank and / or its Service Area, just type in the project address or coordinates in the serarch box and select the search icon. Be aware that attribute table records are only enabled if their related spatial data are inside the extent you are zoomed to in the map view window. No guarantee is given as to the accuracy or completeness of these data. The data are updated without notice on a periodic basis.

    Back to Top

    Other Resources

    Code partially adapted from Marc Goodman's homework assignments and suggestions in 2012 Winter Term CIS 122 Software Design Class at Portland Community College and Lhoucine Zerrouki's 2015 Fall Term CSI-145 Web Design Course at Renton Technical College.

    Back to Top
    John Marshall
    2215 SE Miller Street Apartment 11
    Portland, Oregon 97202
    mobile: 503.913.1695
    Map Explorer
  • Home Base