Select Page

Wenatchee River Salmon Escapement Estimates Using Video Tape Technology in 1990

Mar 31, 1991


The Wenatchee River Salmon Escapement Estimate Project conducted by the Columbia River Inter-Tribal Fish Commission (CRTIFC) is a part of the US-Canada Pacific Salmon Treaty spawning escapement monitoring program (Pacific Salmon Treaty 1985). The purpose of this study is to determine the feasibility of recording fish passage at the Tumwater Dam observation window using a video camera and time-lapse video cassette recorder. The video tape procedure employed will permit a variance to be determined and a bound placed on the escapement estimate through multiple readings of tapes. Bounded estimates are not typically generated from one-time visual fish counts. Video count technology is also beneficial at small projects because it is relatively inexpensive, in terms of personnel time, compared to round-the-clock visual monitoring.



Hatch, D.R. and M. Schwartzberg. 1990. Wenatchee River salmon escapement estimates using video tape technology in 1990. Columbia River Inter-Tribal Fish Commission Technical Report 91-3. Portland, OR. 36p.



Report No.


Media Type

CRITFC Technical Report