Pacifastacus leniusculus
Pacifastacus leniusculus
(Signal Crayfish)
Crustaceans-Crayfish
Native Transplant
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3 results for Pacifastacus leniusculus (Signal Crayfish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1697424 CAMarinFound at a series of natural cascades 3 to 7 meters high at Fern Creek, 900 meters from the confluence with Redwood Creek in the Muir Woods National Monument1997 18050005 Tomales-Drake Bays 
1754354 CAMarinOlema Creek, 7.5 mi NW Bolinas, S.R. 11997 18050005 Tomales-Drake Bays 
1697423 CAMarinRedwood Creek in Muir Woods National Monument1954 18050005 Tomales-Drake Bays 

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/19/2026].

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