Field Activity 2019-650-FA

Identifier 2019-650-FA
Purpose Collect surface samples of sediment in Klamath estuary, to characterize salmonid habitat.
Location Klamath estuary, northern California
Summary Approximately 80 samples were collected during the field activity. All samples that are analyzable will analyzed for grain size.
Info derived sediment grain size
Comments Vessel and equipment are owned and operated by USGS California Water Scinece Center colleagues. Entries for this field activity are based on entries from related Field Activity 2018-680-FA
Explorer G62-2733K
Start Klamath, CA 2019-10-15
End Klamath, CA 2019-10-18
Days in the field 5
West -124.08186272
East -122.08186272
North 40.09495047
South 38.09495047


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Amy East
Crew members
Information specialist(s)
Amy East
Specialist, Information
Affiliate principal Scott Wright, USGS CA Water Science Center Jenny Curtis, USGS CA Water Science Center

Data types and categories

Data category: Location-Elevation, Sampling
Data type: Navigation, Geology

Equipment used

Equipment Usage description Data types Datasets
GPS Navigation (no data reported)
Van Veen Biology, Geology 1


Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Sediment grain-size data from the Klamath estuary, California Van Veen This data release includes grain-size measurements of sediment samples collected from the substrate surface and uppermost 10 cm of sediment deposits in the Klamath estuary, northern California. Samples were collected using a BMH-60 bed-material sampler deployed from a boat, or by hand trowel from subaerial or shallow-water (less than 0.5 m water depth) regions along the estuary margins and side channels. Sediment grain size was analyzed at the U.S. Geological Survey (USGS) laboratory in Santa Cruz, Calif. Particles coarser than 2 mm were sieved using a RO-TAP sieve shaker, and particles finer than 2 mm were analyzed with a Coulter laser particle-size analyzer (LPSA), after organic matter had been removed using a hydrogen peroxide solution. At some submerged locations where sampling was attempted, no sample was recovered. The field crew observed this occurring in places where the substrate was too coarse-grained to be collected by the bed-material sampler (cobbles), where large particles were embedded in finer (poorly sorted) matrix, and where sediment was covered by algal mats thick enough to prevent the sampler from accessing the sedimentary substrate. Locations where sampling was attempted but no sample was recovered are indicated in the Comments column within the data spreadsheet. The sediment samples were collected under a Cultural Resources Management Permit issued by the Yurok Tribe, whose support the USGS acknowledges gratefully. Amy East


Samples collected during this field activity