Different dates may have been used in previous years, but all our current queries use these date designations for all year's data. The following table lists the from and to dates that counts are available for each year and site. On these days, we did not add a record to our database. If a zero count adult salmon date occurred during the counting season varies by dam , then it can be assumed that there were zero fish counted for all adult salmon and steelhead species at the ladder in question. This is consistent with the other Dams. Unclipped steelhead are counted separately from hatchery steelhead at Corps dams on the Columbia and Snake Rivers.
Data Courtesy of U. Chinook Run Schedules. Fish counting by video tape takes at least a few days to process: the fish counters have to make, collect, and read the tapes, and then submit their fish counts. DART retrieves and posts the data as soon as it is made available.
Summer Chinook are not counted at Willamette Falls Dam. Additionally, shad are typically not counted at any of the Corps dams after August 31 each year and shad are not counted at all Corps dams. Unclipped steelhead are identified as fish with an intact adipose fin. However, it is known that some hatchery fish do not have their adipose fin removed. Therefore, not all unclipped steelhead are wild fish.