Pay Invoice
Pay Invoice
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

Find a Local Contact Near You

Featured Insights

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. Mitigation is increasingly applied to specific types of wetlands, streams, and rivers that have specific problems or issues. The complexity associated with stream restoration allows for the use of mitigation to offset the damage. 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 project 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 as well. While slightly delaying project timing, it added significant value that was worth the wait.

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 opinions

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

Stream Mitigation Bank 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


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