Key Personnel:
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Arlin Grimes, Project Manager/Operator
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Ryan Wheat, Supervisor Operator
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Paul Thomas, Operator
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Jessie Hannifin, Operator
Project Summary:
This project involved the construction of a stabilized riffle to raise the streambed for an irrigation diversion. The riffle, designed with a 5% slope, spanned 250 feet. The channel was initially graded to a depth of 6 feet below the intended final grade. Oversized, angular rock was then placed within the cut to reach the final grade elevation. Native gravel was incorporated into the rock matrix to minimize subsurface water loss into the larger rock voids.
A cross-vane weir was installed downstream of the riffle to provide grade control. Bank stabilization was achieved through the installation of 350 feet of log toe revetment, utilizing 150 trees harvested from the project site. Ten log jam structures were strategically placed along the channel edges to enhance habitat complexity and stability.
During stream construction, water was diverted using the existing irrigation diversion and returned to the channel below the project reach to isolate the construction zone. Following channel completion, a new settling basin and fish screen were installed to improve water quality and protect aquatic life.
Equipment Used:
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Cat 320 ELRR Excavator with Topcon GPS
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Cat 329FL Excavator with Topcon GPS
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Komatsu PC-138 Excavator
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Komatsu D-61 Dozer
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30-ton Articulated Haul Truck