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Interrogation Site Metadata

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TWX - Estuary Towed Array (Exp.)

Status:   Active - Non-Operational
Site Type: Trawl Net  |  Organization: NOAA Fisheries
General 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-2021-167-P-B3.xml
Date Last File Loaded: 6/16/2021 2:51 PM
Date Last File Opened: 6/16/2021 11:00 AM
Date Last File Closed: 6/16/2021 12:00 PM
Last Observation Tag: 3DD.003D3F7952
Last Observation Date: 6/16/2021 11:57 AM
Detection Summary: Last Day's Observations

Contacts

Primary Contact:

Paul Bentley
Paul.Bentley@noaa.gov
503-861-1818

Data Steward:

Erika Holcombe
erika.holcombe@noaa.gov
503-861-1818

Location

Coordinates: 46.142688, -123.335061  |  River Km: 075

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.

Year Start Date End Date Comments
2021
2020 TWX did not operate in 2020 due to COVID-19 restrictions.
2019 4/3/2019 12:00 AM 6/15/2019 12:00 AM Start and end dates based on timer tags.
2018 3/29/2018 12:00 AM 7/13/2018 12:00 PM An experimental stationary barge with 12 vertical FINS antennas was added to the site configuration for the 2018 season.
2017 3/17/2017 12:00 AM 6/16/2017 12:00 AM
2016 3/24/2016 12:00 AM 7/5/2016 12:00 AM
2015 3/19/2015 12:00 AM 7/2/2015 12:00 AM
2014 3/18/2014 12:00 AM 8/1/2014 12:00 AM See event log for sampling schedule details.
2013 3/25/2013 12:00 AM 7/25/2013 12:00 AM Sampled intermittently from March 25 - April 29. Two shift sampling (one daylight, one darkness) occurred from April 29 - June 6. Sampled intermittently from June 6 - July 25.
2012 3/15/2012 12:00 AM 7/30/2012 12:00 AM Sampling started on March 15 and ended on July 30.
2011 3/22/2011 12:00 AM 7/1/2011 12:00 AM Initial monitoring effort consists of sampling three days per week. Intensive sampling (two daily shifts) was conducted from May 2 to June 10.
2010 3/23/2010 9:00 AM 8/4/2010 12:00 PM Refer to the TWX event log for details of TWX operations in 2010.
2009 3/6/2009 12:00 AM 8/12/2009 12:00 AM See event log for detailed operational comments.
2008 3/7/2008 12:00 AM 10/30/2008 12:12 PM Refer to the TWX event log for a detailed explanation of operations. Regular operations were suspended between August 20 and September 29.
2007 3/7/2007 12:00 AM 7/19/2007 12:00 AM Refer to the TWX event log for a detailed description of 2007 operations.
2006 3/9/2006 12:00 AM 10/30/2006 12:00 AM Refer to the TWX Event Log for sampling schedule and effort. There was no sampling between July 21 and September 5.
2005 4/20/2005 9:30 AM 8/5/2005 12:00 AM TWX sampling began 20 April 05. Sampling with 2 daily crews occurred between 27 April and 17 June. Sampling with a single daily crew working 4 or 5 days per week continued until 4 August.
2004 4/14/2004 8:54 AM 7/3/2004 10:33 AM While TWX files are available from April 8 onward, Dick Ledgerwood reports that TWX sampling operations did not begin until April 14, 2004.
2003 4/22/2003 11:00 AM 6/30/2003 12:00 PM Dates per Dick Ledgerwood; times derived from first/last data files.
2002 4/13/2002 6:00 PM 7/30/2002 12:00 PM
2001 4/20/2001 11:48 AM 6/22/2001 10:20 AM Dates and times based on first/last reported detections.
2000 4/18/2000 10:26 AM 6/21/2000 11:47 AM Dates and times based on first/last reported detections.
1999 4/9/1999 9:18 AM 6/8/1999 8:47 AM Dates and times based on first/last reported detections.
1998 4/8/1998 3:14 PM 6/21/1998 12:00 PM Dates and times based on first/last files submitted to PTAGIS.
1996 4/24/1996 10:05 AM 6/13/1996 11:13 AM The Start_date and End_date values reflect the first and last dates of detection, respectively. The actual interval of operational dates is not known.

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.

Select Configuration Number:
Start Date:  7/15/2018
End Date:  ----

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.

Select Equipment Type:
Equipment Code Description Start Date End Date

Photos

Photos are contributed from stewards of the site.

Event Log Summary

Event Date Event Type Comments
12/31/2020 3:00:00 PM SiteDown Sampling for the TWX site was cancelled for the 2020 season due to COVID-19 restrictions and therefore no data was collected.
1/29/2020 11:10:30 AM General During 2019, we sampled for 749 h with the matrix trawl and detected 11,579 tagged fish. Intermittent sampling began on 27 March, and effort was gradually increased to two daily shifts during the juvenile migration peak (28 April-15 June). We ended sampling on 15 June. In total, we detected 4,714 spring/summer Chinook, 665 fall Chinook, 399 coho, 533 sockeye salmon, 4,975 steelhead, 4 cutthroat trout, and 289 fish with no species data in the PTAGIS database. During the peak migration period, we detected 1.7% of the yearling Chinook salmon and 2.7% of steelhead previously detected at Bonneville Dam, along with 1.5% of the yearling Chinook and 2.6% of the steelhead released from transport barges just below the dam.
12/4/2018 1:40:14 PM General During 2018, we sampled for 695 h with the matrix trawl and detected 9,990 tagged fish. Intermittent sampling began on 26 March, and effort was gradually increased to two daily shifts during the juvenile migration peak (29 April-16 June). We ended sampling on 16 June. In total, we detected 3,036 spring/summer Chinook, 738 fall Chinook, 423 coho, 660 sockeye salmon, 4,842 steelhead, 4 cutthroat trout, and 287 fish with no species data in the PTAGIS database. During the peak migration period, we detected 1.0% of the yearling Chinook salmon and 1.5% of steelhead previously detected at Bonneville Dam, along with 0.7% of the yearling Chinook and 2.2% of the steelhead released from transport barges just below the dam.
1/17/2018 12:00:00 AM General During 2017, we sampled for 711 h with the matrix trawl and detected 8,419 tagged fish. Intermittent sampling began on 17 March, and effort was gradually increased to two daily shifts during the juvenile migration peak (30 April-15 June). We ended sampling on 16 June. In total, we detected 3,169 spring/summer Chinook, 535 fall Chinook, 207 coho, 175 sockeye salmon, 4,109 steelhead, 2 cutthroat trout, 2 Pacific Lamprey, and 220 fish with no species data in the PTAGIS database. During the peak migration period, we detected 1.0% of the yearling Chinook salmon and 1.3% of steelhead previously detected at Bonneville Dam, along with 0.9% of the yearling Chinook and 3.0% of the steelhead released from transport barges just below the dam.
1/5/2017 10:28:04 AM General During 2016, we sampled for 829 h and detected 12,165 tagged fish. Sampling began on 24 March with a daily shift, and effort was gradually increased to two daily shifts during the juvenile migration peak (1 May 9 June). After 9 June, we scaled back to a single daily shift until 5 July. In total, we detected 5,217 spring/summer Chinook, 323 fall Chinook, 697 coho, 234 sockeye salmon, and 5,313 steelhead. During the peak migration period, we detected 2.0% of the yearling Chinook salmon and 3.4% of steelhead previously detected at Bonneville Dam, along with 1.6% of the yearling Chinook and 2.8% of the steelhead released from transport barges just below the dam.
3/24/2016 10:44:00 AM SiteUp Trawl sampling began on 24 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration.
7/5/2015 2:42:00 PM General During 2015, we sampled for 813 h and detected 19,889 tagged fish. Sampling began on 19 March with a daily shift, and effort was gradually increased to two daily shifts during the juvenile migration peak (4 May 11 June). After 11 June, we scaled back to a single daily shift until 2 July. In total, we detected 8,806 spring/summer Chinook, 730 fall Chinook, 603 coho, 744 sockeye salmon, and 8,284 steelhead. During the peak migration period, we detected 3.3% of the yearling Chinook salmon and 4.6% of steelhead previously detected at Bonneville Dam, along with similar proportions of fish released from transport barges just below the dam
3/19/2015 1:58:00 PM SiteUp Trawl sampling began on 19 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration.
8/1/2014 7:47:00 AM SiteDown During 2014, we sampled for 925 h and detected 15,904 tagged fish. Sampling began on 18 March with a daily shift, and effort was gradually increased to two daily shifts during the juvenile migration peak (28 April 12 June). After 12 June, we scaled back to a single daily shift until 30 July. In total, we detected 6,744 spring/summer Chinook, 684 fall Chinook, 545 coho, 886 sockeye salmon, and 6,765 steelhead. During the peak migration period, we detected 1.8% of the yearling Chinook salmon and 2.4% of steelhead previously detected at Bonneville Dam, along with similar proportions of fish released from transport barges just below the dam.
3/18/2014 2:46:00 PM SiteUp Trawl sampling began on 18 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration.
3/18/2014 2:46:00 PM General Trawl sampling began on 18 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration.
12/31/2013 9:35:00 AM General Trawl sampling to detect PIT-tagged juvenile salmonids in the estuary began on 25 March 2013. Intermittent sampling gradually increased until 29 April to 6 June when two daily shifts were used. Following this period we resumed intermittent sampling until 25 July. During the two shift period we sampled in daylight and darkness, averaging14 sample hours/d, and detected 2.7% of yearling Chinook salmon and 3.8% of steelhead previously detected at Bonneville Dam (a rough measure of sample efficiency). In total, we detected 22,879 salmonids in 889 hours of sampling (10,400 spring/summer Chinook salmon, 1,061 fall Chinook salmon, 9,299 steelhead, 1,023 sockeye salmon, 747 coho salmon, 7 cutthroat trout, and 342 fish with no release information in PTAGIS).