The easiest way to understand what Stillwater does is to show you. We’ve selected a variety of watersheds and problems to give you a sense of the scope and depth of our science. Please feel free to contact the project scientists whose names can be found on each page if you have additional questions, or want to know more about the project.
An experimental gravel augmentation program downstream of the Pelton-Round Butte Hydroelectric Project is helping our client evaluate project-related effects on spawning habitat for salmon on the Deschutes River.
Stillwater Sciences is working to restore 25 miles of lower Putah Creek and 300 acres of tidal wetlands to improve salmon habitat, floodplain connectivity, and ecological function within the creek and Yolo Bypass.
We developed a comprehensive mitigation and monitoring plan to efficiently satisfy regulatory requirements for an idle fuel pipeline removal in Humboldt Bay.
Stillwater Sciences conducted a large-scale, comprehensive fisheries monitoring program in Clear Creek watershed on the Nez Perce-Clearwater National Forest.
Stillwater biologists have been supporting the Pacific Gas and Electric Company during the decommissioning of the Humboldt Bay Power Plant’s (HBPP) nuclear and oil-fired generating units in King Salmon, California.
Elk River, the largest tributary to Humboldt Bay and natal stream to four species of anadromous salmonids, is undergoing intensive watershed-wide recovery efforts to remediate impacts associated with excessive channel sedimentation that occurred between 1986 and 1998.
Working with The Nature Conservancy (TNC), Stillwater Sciences developed a scientifically-based framework to guide restoration of winter habitat for coho salmon in the Ten Mile River basin of Mendocino County, California.
Stillwater scientists are developing tools to quantify environmental benefits of restoring the Lower Mokelumne riparian corridor as part of a voluntary payment for ecosystem services program that links public and private money to participating landowners.
Habitat in the upper reaches of the North Umpqua River became available after the construction of a fish ladder over Soda Springs Dam. Stillwater biologists evaluated and mapped suitable spawning and rearing habitats for lamprey in this newly accessible reach.
More Case Studies
Working with the Muckleshoot Indian Tribe, we evaluated the impacts of fine sediment on the survival of salmonid eggs on the Green River in Washington in order to guide future habitat protection and management.
Stillwater Sciences is conducting biological resource surveys, preparing environmental compliance documents, and providing construction compliance for the reconductoring of the Missouri Flat–Gold Hill 115 kV power line in El Dorado County, CA.
Using existing data and a field assessment, we developed a predictive model to estimate instream flow requirements for steelhead throughout all watersheds in San Luis Obispo County.
Combining ecological, hydrological, and geomorphic analyses to prioritize restoration locations and strategies for the flood-prone and ecologically sensitive Virgin River flowing through Utah, Arizona, and Nevada.
We helped our client understand effects of sediment and hydrology on fish habitat in the Sultan River, Washington to better manage river reaches downstream of dams on the Jackson Hydroelectric Project.
Using spatial data sets and GIS analysis that was corroborated with field data, we developed a monitoring plan that identified and characterized risks for salmon habitat in the Copper River Watershed.
We have developed numerous environmental permitting documents and an aquatic habitat assessment model, provided conceptual design support, and performed bank surveys and mapping for over 50 levee repair sites in the Delta and Sacramento River system.
We developed a series of recommendations to help the state of Washington effectively allocate funding to reduce potential impacts of climate change on stormwater infrastructure as part of this multi-disciplinary study.
We evaluated possible impacts of removing Marmot Dam – one of the first large-scale releases of dam-impounded sediment in the United States.
We have recently begun a study in northern Santa Barbara County to identify the flows necessary for steelhead passage through the Santa Maria River during their winter/spring adult and juvenile migration period.
To understand the potential effects of various dam removal scenarios on the Klamath River, we applied our DREAM-1 suspended sediment transport model, and assessed the potential biological effects of sediment release and water quality impacts.
Stillwater led a team of technical experts to develop and evaluate approaches for reducing nutrient loads and improving water quality in the Klamath River Basin.
Through geomorphic, fisheries, and engineering studies, Stillwater is supporting the development of a detailed watershed assessment and set of restoration alternatives for southern steelhead passage in the Santa Paula Creek Watershed.
In order to evaluate the Sespe Creek watershed’s response to the 2006 Day Fire, Stillwater is conducting a geomorphic assessment to understand the fire-related effects on hydrology, hydraulics, and sedimentation in the watershed.
We hypothesized that sediment infiltration into redds may be causing low coho and steelhead returns in certain years, and implemented a pilot study to assess possible mechanisms.
We developed the conceptual restoration design and are currently monitoring post-implementation revegetation success on Bradford Island in the Sacramento-San Joaquin Delta.
Stillwater is supporting the Eugene Water & Electric Board in its relicensing of the Carmen-Smith Hydroelectric Project, located on the McKenzie River in the western Cascades of Oregon.
To help guide the discussion and establish baseline conditions, Stillwater is conducting a limiting factors analysis on four focal species in the basin and has developed an innovative on-line tool for managing information related to the project.
Stillwater Sciences is evaluating ecological conditions in the lower Santa Clara River to inform and develop a Floodplain Restoration Feasibility Study.
Stillwater is overseeing the compilation and delivery of the license application for PG&E's McCloud-Pit Hydroelectric Project.
A geomorphic evaluation and site-specific hydraulic modeling were used to develop bank protection and stabilization measures along an eroding bluff on the lower Mad River.
A flume provides a small-scale version of a stream reach and enables researchers to investigate specific geomorphic questions with applicability to large-scale restoration projects.
Most of the large woody debris and boulders have been placed in a reach of Rock Creek, a tributary to the North Umpqua River, to test juvenile coho salmon population response to large-scale habitat enhancements.
From developing the nearly 300-page Merced River Corridor Restoration Plan, to implementing on-the-ground vegetation and channel restoration and establishing baseline ecological conditions, Stillwater has been a key player in helping to guide the management of the Merced River.