Civil & Structural Design
Client: Wasco County Soil and Water Conservation District
Mill Creek is a moderately-sized tributary to the Columbia River that originates on the eastern slope of Mt. Hood and flows northeast through the City of The Dalles, Oregon. Urbanization along the lower two miles of Mills Creek in the City of The Dalles resulted in the simplification of the aquatic and riparian habitats. In 2011, The Dalles Watershed Council (DWC) commissioned an evaluation of the urbanized reach to assess land use impacts and identify opportunities for habitat restoration. Following the initial assessment, a preliminary engineering design was developed for the Honald/Buyers property. The preliminary design included excavation and connection of a historic side channel that had been partially filled, utilization of an existing side channel as a backwater alcove, installation of a precast spanning bridge across the reconnected side channel, and installation of large wood structures along the channels and floodplain to increase roughness and improve habitat conditions.
The pond construction at Pilarcitos Quarry included two bentonite-lined ponds within the Nuff Creek watershed, each designed to improve habitat for red-legged frogs. Waterways provided planning services to site the ponds, performed topographic and construction surveying, prepared preliminary and final designs, provided permit support, and supervised the construction effort.
Client: California Trout, Inc.
Lower Hat Creek is an important coldwater fishery and is a designated Wild Trout Fishery by the California Department of Fish and Wildlife. Decades of cattle grazing, the introduction of muskrats, and over fishing caused the degradation of riparian and aquatic habitat along lower Hat Creek. Waterways, in collaboration with Streeter Group and California Trout, Inc., completed designs to restore a reach of Hat Creek. The restoration measures included installing a 160’-long pedestrian bridge and trail, and relocating the parking facilities that improve angler access and reduce habitat disturbance.
Client: San Lorenzo Valley Water District
Waterways is assisting the San Lorenzo Valley Water District by leading the design team on the Fall Creek fish ladder and diversion screening project. The project involves retrofit of an existing fish ladder and diversion intake structure to comply with current DFW and NOAA fish passage and screening standards. The design lowers existing intake screens and weirs while also adding two additional weirs downstream of the existing ladder to reduce individual jump heights. Phase one was constructed in 2014 and phase two is planned for the summer of 2021.
Waterways staff assisted the NRCS in the fall of 2015 with construction phase services for the implementation of agricultural pond repairs in Alameda County. Our role included construction staking and as-built mapping, construction observation and reporting, and field engineering services.
Client: South Coast Habitat Restoration
Waterways was retained by South Coast Habitat Restoration to prepare designs for improving fish passage at five barriers along Gaviota Creek. The sites are located north of Gaviota and directly adjacent to Highway 101. Each barrier is composed of a concrete grade control structure, originally installed to keep the creek from undermining Highway 101. Design concepts range from structural modification of individual weirs to complete removal and channel realignment.
Client: Monument Soil and Water Conservation District
Cottonwood Creek is a major tributary to the North Fork John Day River and has been identified as critical habitat for Middle Columbia River steelhead. The lower four miles of the creek enters a broad valley, providing opportunities for agriculture that relies on the water of Cottonwood Creek for production. There are currently 12 diversion sites along lower Cottonwood Creek, referred to as points of diversion (POD’s). Many of these diversions result in fish passage barriers during the low flow season. The Monument Soil and Water Conservation district requested Waterways assistance in the assessment of channel stability and fish passage for all 12 PODs and designs for three of the known fish passage barriers.
Client: Resource Conservation District of Santa Cruz County
Waterways Consulting has provided planning, design, and construction implementation support (e.g., staking, field modifications, and supervision) for the installation of 3 ponds located on the Watsonville Slough Farm property, owned by the Land Trust of Santa Cruz County. The ponds were created either as a stormwater or sediment control facility or for habitat enhancement.
Waterways is teaming with CMAG Geotechnical Engineers to assist the Resource Conservation District of Santa Cruz County and USFWS with the siting, design, and installation of multiple ponds to enhance and expand habitat for the endangered Santa Cruz Long Toed Salamander.