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![Lowering Secchi disk to determine relative turbidity (amount of suspendedsediment) in the water fizh0137.jpg Lowering Secchi disk to determine relative turbidity (amount of suspendedsediment) in the water](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fizh0137.jpg?itok=Ge4JA9LO)
Description
Lowering Secchi disk to determine relative turbidity (amount of suspendedsediment) in the water. The depth at which the disk is no longer visible can be related to the amount of suspended material in the water. (Image credit: NOAA Central Library Historical Fisheries Collection | J. Olson BCF)
Credit
NOAA Central Library Historical Fisheries Collection
Photographer
J. Olson BCF
Display Date
1960 circa
Location
Alaska Southeast
Collection
Historic Fisheries