Site Type

Site Name


HLX - Hemlock Dam Fish Ladder Exp.

This experimental interrogation system was located in the adult fish passage ladder at Hemlock Dam, on Trout Creek in the Wind River (WA) Basin.

Operated by:


First year:


Last year:




Site Contacts


Ian Jezorek
(509) 538-2299 x222


Operational Dates

Year Start Date End Date Notes
2004 7/12/2004 1/1/2005 First year of operation. Start date provided by Ian Jezorek.
2005 1/1/2005 1/1/2006
2006 1/1/2006 1/1/2007 Data collection was interrupted due to high water between Dec. 29, 2005, and Jan. 3, 2006, and again between Jan. 10 and Jan. 20.
2007 1/1/2007 1/1/2008 At about 11:30 AM on 12/3/07 the two transceivers at HLX were shut down and relocated due to flooding. The site resumed operations on Dec. 5, with antenna #15 only.
2008 1/1/2008 1/1/2009 Antenna #22 was lost at the end of 2007, so the site is operating with antenna #15 only.
2009 1/1/2009 7/1/2009 The fish ladder at Hemlock Dam was dewatered on July 1, 2009 in preparation for the removal of the Dam. At that time the HLX interrogation site recorded its final data and was decommissioned.

Current and Historic Site Configurations

Config Seq: 100

Start Date: 7/12/2004

End Date: 7/1/2009