Site Type

Site Name


ZSL - Zosel Dam Combined

Zosel Dam is located at Okanogan River km 132, approximately 3 km downstream from the outlet of Lake Osoyoos in the town of Oroville, Washington. The dam has two fish ladders and four spillbays. PIT tag detection was established at the dam by attaching antennas to the downstream faces of two weirs in each fish ladder. Each weir has a single vertical slot that is approximately 16 in. wide and 120 in. high. Few juveniles use the fish ladder and, at high water, adults can also bypass the fish ladders by swimming through the spillbays. To detect fish passing through the spillbays, in April, 2015 a 10ft x 4ft floating antenna was added in the west-most spillbay and, on March 16, 2016, a similar antenna was added to the east-most spillbay. These antennas are placed in the middle of the spillbays which are approximately 20ft wide.

Operated by:


First year:


Last year:




Site Contacts


Jeff Fryer
(503) 731-1266


Brett Turley
(208) 955-6771


Photo Gallery

Operational Dates

Year Start Date End Date Notes
2014 1/1/2014 1/1/2015
2016 1/1/2016 1/1/2017 Start and end dates based on timer tags.
2015 1/1/2015 1/1/2016
2017 1/1/2017 1/1/2018 Start and end dates based on timer tags.
2010 9/1/2010 1/1/2011 First year of operation.
2011 1/1/2011 1/1/2012
2012 1/1/2012 1/1/2013
2013 1/1/2013 1/1/2014
2018 1/1/2018 1/1/2019 Start and end dates based on timer tags.

Current and Historic Site Configurations

Config Seq: 130

Start Date: 3/16/2016

End Date:

Config Seq: 120

Start Date: 3/31/2015

End Date: 3/16/2016

Config Seq: 110

Start Date: 3/5/2013

End Date: 3/31/2015

Config Seq: 100

Start Date: 9/1/2010

End Date: 3/5/2013

Event Logs