In-river Work for Lewiston/Dark Gulch |
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After project completion |
Area prior to rehabilitation project |
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View from the Old Bridge in Lewiston looking up river. Alternating gravel bars are designed to change a long, linear reach of river to one with a more diverse and meandering form. Coarse sediment will also improve spawning and rearing habitat for juvenile salmon and steelhead.
Construction of the Lewiston-Dark Gulch Channel Rehabilitation Project began in late August. In-river work was completed by September 15 to comply with requirements of several regulatory agencies. Additional work outside the river channel will resume in mid-October, and be completed by December of this year. The overall project includes placement of almost 11,000 cubic yards of coarse sediment and re-contouring areas adjacent to the Trinity River. The coarse sediment is an important ingredient to a dynamic, healthy river system and is utilized by salmon and steelhead for spawning. Associated floodplain re-contouring and side channel construction is designed to create areas of relatively slow moving, shallow water and edge habitat that can be utilized by juvenile fish for rearing purposes.
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Constructing gravel bars near Lewiston |
Constructing a side channel |
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The initial cut |
Placing the tree |
The finished product |
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