Expertise in Southern California Watershed Issues

Stillwater Sciences are watershed experts who have been building ecologically-based adaptation and resilience into our communities since 1996. With a long history of partnerships with southern California agencies―including the City of LA, City of Pasadena, County of Los Angeles, and many others―Stillwater scientists lead and build consensus around ecosystem restoration in conjunction with infrastructure and water management. Our work in the greater Southern California region focuses on partnerships and alignment with federal and state watershed and native habitat restoration principles and objectives, resulting in effective species recovery programs and multi-benefit projects across our watersheds and local communities. Our services include:

  • River restoration
  • Lake rehabilitation
  • Fisheries science
  • Fish passage design and engineering
  • Watershed planning and implementation
  • Park and trail planning
  • Stormwater planning and engineering design
  • Regulatory compliance (CEQA, NEPA, permitting)
  • Funding strategy
  • Integrated water management strategy
  • Multi-benefit project design
  • Biodiversity and multi-species habitat planning
  • Fluvial geomorphology
  • Sediment management and modeling
  • Dam removal
  • Wetland design
  • Endangered species recovery
  • Urban stream renewal
  • Fish reintroduction and monitoring
  • Biological resource assessments
  • Groundwater dependent ecosystems
  • Water quality studies

Featured Projects

Los Angeles River Fish Passage and Habitat Structures

In partnership with the City of Los Angeles and Bureau of Reclamation, Stillwater is leading the planning and design of the first steelhead fish passage pilot project providing instream habitat structures in the LA River.

Urban Orchard Park Wetlands and Trout Stream

Stillwater scientists led the ecological design of a 1-acre native wetland and constructed pool-riffle-run stream to support native plants, fish, and wildlife in the City of South Gate. Read more.

LA County Urban Parks Technical Assistance Program

Stillwater is leading the development of integrated water and biodiversity tools to improve parks, open space, and native habitat and targeted species recovery opportunities. Read more.

City of Los Angeles Biodiversity Expert Council

Stillwater Sciences is providing watershed science and ecological expertise to implement the City’s biodiversity action plan with specific attention to aquatic ecology, fisheries, and riparian species. Read more.

Arroyo Seco Native Fish and Stream Restoration

Stillwater Sciences has been working closely with the City of Pasadena, Arroyo Seco Foundation, and other stakeholders on the recovery of native fish habitat from the San Gabriel Mountains headwaters to Arroyo Seco confluence with the LA River. Read more.

Upper Santa Ana River Tributaries Restoration

Stillwater Sciences is part of a team providing geomorphic, fisheries, and engineering design services in the creation of habitat for the Santa Ana sucker and other target species. Read more.


Meet our Southern California Team.