Salmon Snapshots

Caspar Creek

2016/17 Population

Estimate of Ocean Returning Fish


Oncorhynchus kisutch


Oncorhynchus mykiss

What We Have  
What We Need  

Population estimates (derived from mark/recapture data) provided by California Department of Fish and Wildlife. The California Coastal Salmonid Monitoring Program for Caspar Creek initiated in 2006/07. The 95th % confidence interval is 56 to 64 for coho and 19 to 29 for steelhead. Data are preliminary and subject to change.

Coho salmon are federally listed as endangered. Steelhead are federally listed as threatened. The “What We Need” spawner population abundance targets shown above represent just one of several criteria that the National Marine Fisheries Service considers when determining whether a species should be removed from the Federal List of Endangered and Threatened Wildlife and Plants (50 CFR 223.102). Recovering any of the species entails meeting criteria for abundance, productivity, diversity, and spatial structure across multiple watersheds, as well as criteria for alleviating threats (NMFS 2012, NMFS 2016).

Area under the curve residence time from Gallagher et al. 2010, observer efficiency from mark-recapture 2017.

The 2016/17 snapshot is defined as fall 2016 to spring 2017, as per when salmon and steelhead return from the ocean to spawn. Fall Chinook spawning season is fall 2016. Coho season is fall through early January 2017. Steelhead season can start in fall 2016 but is primarily winter and spring 2017. Spring Chinook return in spring 2016 and spawn in the fall 2016.


National Marine Fisheries Service. 2016. Final Coastal Multispecies Recovery Plan. National Marine Fisheries Service, West Coast Region, Santa Rosa, California.


fish images © Joe Tomelleri