Interrogation Site Metadata
TWX - Estuary Towed Array (Exp.)
Status: Active - Non-OperationalGeneral Operational Period: Seasonally
Start Date: 4/24/1996 10:05 AM
The TWX site is located in the upper Columbia River estuary, between Eagle Cliff (rkm 84) and the west end of Puget Island (rkm 66). This site is sampled annually by NOAA Fisheries during the spring and summer outmigration of juvenile salmonids. There are currently two detection systems in use. The trawl, operated since 1995, is a surface pair-trawl with a matrix of six rectangular antennas fitted into the cod end of the net. The matrix is configured with three parallel antennas in front and three in the rear, forming a corridor that allows fish to pass through while being detected by the antennas. The flexible antenna system was developed in 2015 and is a modular array, consisting of up to twelve rectangular antennas, connected side-by-side in a vertical orientation. These are constructed of manufactured antenna cable and are also towed between two vessels. These two systems operate 3-7 days per week from mid March to mid June. An experimental barge system consisting of 12 vertical FIN antennas was tested in 2018, but removed for the 2019 season.
Current Operations
| Last File Loaded: | TWX-2024-177-P-001.json |
| Date Last File Loaded: | 6/25/2024 9:50 AM |
| Date Last File Opened: | 4/9/2024 7:36 AM |
| Date Last File Closed: | 5/20/2024 8:40 PM |
| Last Observation Tag: | 3DD.0078CB4183 |
| Last Observation Date: | 6/14/2024 12:26 AM |
| Detection Summary: | Last Day's Observations |
Contacts
Location
Operational History
Operational history describes the period the site was interrogating for PIT tags. The comments provide anecdotal information about the operation of the site during this period. Site operational periods are updated typically at the end of the calendar year.
Configuration
Configuration metadata includes details about the equipment used at the site to detect and record PIT tags. A new configuration sequence record is created when equipment is added or removed from the site and the period of time it was active. A configuration sequence without an End Date is currently active.
Equipment History
Select a type to view the history of equipment installed at this site. A missing End Date implies the information about the equipment is current.