IMA Fieldwork Collage
Environmental Projects  
 

 

 

STREAM PROJECTS

 

Project: Upper Hoback River
Location: Bondurant, WY
Date: 2006
Goal:
Increase the available late-season and winter habitat available for Snake River cutthroat trout.

Description:
After peak flows, the upper Hoback is dominated by shallow riffle habitat that provides minimal cover and holding water for cutthroat trout in the fall and winter. Additionally, low winter flows and ice dams combine to minimize the available winter habitat for adult and juvenile trout. During surveys conducted by IMA staff, a number of reference sites were recognized and identified throughout the project reach. These reference sites were characterized by steep riffles that plunged into pools with overhanging willows. Our design sought to replicate these conditions throughout the upper Hoback by excavating pools, introducing channel constrictions, constructing boulder weirs and log drop structures and transplanting willows. The channel constrictions and drops were critical in the design, because they allowed hydraulic forces and velocities to exist similar to those in the reference areas. In addition to the drop structures, pools were located near the apex of channel meanders. A total of 48 pools, 12 pieces of large woody debris and 15 boulder drop structures were placed to create pool habitat features as well as to improve scour and direct velocities to the center of the pools. Transplanted willows were planted along the project reach to provide cover for fish and channel roughness to decrease velocities for juvenile trout.

 

 

 

 

 

 

 

 

  SITE DEVELOPMENT: MELVILLE IT SOLUTIONS
SITE DESIGN: LINDA GRIMM DESIGN