Site Type

Site Name


TMJ - 3-Mile Falls Dam Smolt Bypass

Three Mile Falls Dam (Umatilla River) Juvenile Fish Bypass System. The TMF smolt bypass trap is located at the irrigation diversion screen on the west shore at TMF.

Operated by:


First year:


Last year:




Site Contacts


Doug Peterson
(360) 425-6072


Operational Dates

Year Start Date End Date Notes
1999 3/9/1999 7/8/1999 Dates and times based on first/last reported detections.
2000 3/8/2000 6/18/2000 Dates and times based on first/last reported detections.
2001 3/8/2001 6/14/2001
2002 3/7/2002 6/16/2002
2003 3/3/2003 7/1/2003 Start date reflects beginning of interrogation activities. Between 6/13 and 6/27, the detectors were turned off most or all of the time. During this period, all fish were manually hand-scanned; if a PIT tag was detected, it was reported as a recapture. The interrogation site was shut down for the season at ~9:00 am on 7/1/03.
2004 2/12/2004 7/7/2004 Prior to start-up, the TMJ installation was upgraded from two FS2001 transceivers to two FS1001 transceivers; the facility now receives O&M support from PTAGIS staff in Kennewick. Due to high silt and debris loads in the Umatilla River, the trap at TMJ was removed from service between 1345h on 5/24/04 and 1230h on 6/1/04.
2005 2/1/2005 6/30/2005
2006 2/1/2006 7/11/2006 The trap was out service between April 4 and April 14 due to high flows. The trap was shut down for the season on July 11 due to insufficient water and fish passage. This is the last year for TMJ, which was combined with TMA to form TMF on Nov. 8, 2006.

Current and Historic Site Configurations

Config Seq: 130

Start Date: 1/1/2006

End Date: 7/12/2006

Config Seq: 120

Start Date: 1/28/2004

End Date: 1/1/2006

Config Seq: 110

Start Date: 3/6/2000

End Date: 1/28/2004

Config Seq: 100

Start Date: 3/9/1999

End Date: 3/6/2000