• Site topographic surveying
• Peak flow assessment for design floods
• Hydraulic and geomorphic analysis and design
• LWD integration in step pool sequence
• Regulatory agency permitting support
• Engineering plans and specifications preparation
• Field construction supervision and post-construction maintenance and monitoring

Clearwater Hydrology (CH) prepared a restoration plan for integrated removal of two barriers to fish passage on a coastal steelhead stream in San Mateo County, a tributary to Arroyo Leon and Pilarcitos Creek. CH conducted geomorphic and hydrologic/hydraulic analyses to document existing channel conditions and assessed stable channel design characteristics for the creek reach. CH engineering design included removal of an instream concrete dam and a severe grade drop (9 ft.) produced by scour below an historic bridge, and reconstruction of a stable channel grade and cross-section through more than 1,000 ft. of channel upstream and downstream of the barriers.

CH assisted with permit acquisition and complex interagency coordination, and provided on-site engineering supervision of project construction with joint venture partner, Watershed Science, during the summers of 1997-98. The upstream dam removal and channel restoration also accommodated the construction of an instream infiltration gallery, which supplied water to a rehabilitated water storage and distribution system serving State Parks staff residences. As of the summer of 2002, the cascade remained stable and riparian and wetland vegetation had become well-established, including a nearly closed overhead canopy.

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