Site Type

Site Name


IML - Imnaha River Weir Adult Ladder

The site is located at the Oregon Dept. of Fish and Wildlife (ODFW) fish weir on the Imnaha River. The site was initially installed with two antennas in the ladder; a third antenna was added in June 2018 to monitor all fish handled in the work room at the trap. The antennas are currently driven by Biomark IS1001s and controlled by a Biomark IS1001-MC. The equipment is powered by a Hybrid- TEG (model 5220 and 1kw solar). The readers are connected to the controller via Biomark Data-Over-Power (DOP) cabling. The MC is connected to a satellite modem for remote telemetry. The site is being remotely monitored by Biomark with automatic downloads (and PTAGIS submissions) every four hours. The power supply and remote telemetry are being shared by the three interrogation sites at the weir, IR4, IR5, and IML.

Operated by:


First year:


Last year:




Site Contacts


Joseph Feldhaus
(541) 962-3724


Cameron Albee
(541) 432-2503


Operational Dates

Year Start Date End Date Notes
2016 3/31/2016 9/9/2016 Volitional release of Chinook smolts April 1 - 6. Site down April 7 - May 16. Site down May 19-23. Data lost May 31 - June 1. Site down August 8-12 for upgrades.
2017 3/27/2017 11/7/2017 End date based on file closed date.
2015 5/18/2015 9/10/2015 Site down May 27 - June 4.
2018 3/17/2018 9/14/2018 Volitional release of Chinook smolts began April 3. Site down intermittently April 8-24.
2019 3/27/2019 9/5/2019 Start and end dates based on timer tags.

Current and Historic Site Configurations

Config Seq: 130

Start Date: 6/27/2018

End Date:

Config Seq: 120

Start Date: 8/12/2016

End Date: 6/27/2018

Config Seq: 110

Start Date: 6/4/2015

End Date: 8/12/2016

Config Seq: 100

Start Date: 5/18/2015

End Date: 5/27/2015

Event Logs