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Client Name
Black Hawk Mitigation LLC
Client Type
Project Type
Services Provided
  • Environmental Permitting
  • Environmental Studies
  • Flood Mapping/Elevation Certificates/Letter of Map Changes (LOMC)
  • GIS Mapping & Analysis
  • Hydrologic Modeling
  • Threatened & Endangered Species Studies
  • Topographic Survey & Subsurface Utility Engineering
  • Wetland & Stream Delineation & Mitigation
Project Manager
Contact Jeff Walters
Environmental Sciences Group Leader

Iowa’s First Stream Mitigation Bank

Snyder & Associates assisted in developing the first stream mitigation bank with stream credits available for sale in the state of Iowa. It was created using the Iowa Stream Mitigation Method, the newest Army Corps of Engineers document and model that quantifies stream mitigation requirements. Wetland and stream mitigation banks provide the opportunity to purchase credits for unavoidable impacts to aquatic resources.

Located near the Cedar River in Black Hawk County, the site is comprised of 253 acres of floodplain forest, wetland, and upland. The project began as a wetland mitigation bank, but after completing the fieldwork and working with the Iowa Stream Mitigation Method, we determined it was possible to include stream mitigation also. This slightly delayed the project but added significant value to it.

We completed the necessary environmental documentation and design for the bank. The banking instrument addresses:

  • Project design
  • Native seeding and tree plantings
  • Invasive species removal and prescribed fire recommendations
  • Long-term management
  • Cost opinion

Collaboration with the Interagency review team (IRT) was critical to obtaining approvals for the Black Hawk Mitigation Bank to sell credits and construct the bank. The IRT consisted of the:

  • Iowa Department of Natural Resources
  • U.S. Environmental Protection Agency
  • U.S. Army Corps of Engineers
  • U.S. Fish and Wildlife Service
  • Natural Resources Conservation Service

Black Hawk Mitigation & Approval Process

Our team provided extensive environmental services for the project over the course of three years. The services ranged from wetland delineation, threatened and endangered species habitat survey, 404 permitting, and floodplain permitting.

Pivotal milestones of the Black Hawk Mitigation Bank are:

Data Gathering

  • Wetland Delineation
  • Threatened and Endangered Species Review
  • Cultural Resource Investigations

Preliminary Design

  • Draft Prospectus
  • Final Prospectus
  • Concept Design
  • Public Notice
  • IRT Meeting Draft Banking Instrument
  • Topographic Survey
  • Floodplain Approval

Final Design

  • Final Banking Instrument
  • Forest Management Plan
  • Conservation Easement

Construction

  • Stormwater Pollution Prevention Plan (SWPPP)
  • Construction Monitoring
  • As-builts