The Adult Escapement for the Columbia Basin web page was originally created for the purpose of allowing people to compare interim target abundances set by NMFS in their April 2002 memo with historical trend data.
We are in the process of updating the Adult Escapement for the Columbia Basin web page to include the Interior Columbia Technical Review Team's (ICTRT) most recent population viability analyses and salmonid recovery information, which replaces the April 2002 version published on this web site. The updated Adult Escapment indices are currently available through the CBR Status & Trends Overview database.
The site will include 44 interior Columbia Basin salmonid population escapement indices, with each index consisting of a natural spawner series and a hatchery spawner series. As before, the estimates are derived from either expanded redd counts or live counts. The source for the data, rationale for the minimum threshold target abundances, and methodology for developing the estimates will be explained and documented in the notes section with relevant literature citations.
There will be 28 Chinook (spring, summer and spring/summer runs) salmon and 15 steelhead (winter and summer run types) population escapement aggregate indices along with the Redfish Lake sockeye redd index, Asotin River summer steelhead redd index, and Snake River fall Chinook index from the April 2002 memo.
Note that some of the series will have changed to reflect new estimation methods used by the ICTRT, and most of the old population aggregates will not be available as they were not updated by the ICTRT.