EVENT LOG FOR SITE TWX

        The first line of each entry contains a date/time stamp & who is reporting.
        The most recent entry is listed first.

Date       Time  Who
---------- ----- --------
12/17/2008 14:51 Bob_Magi
    Fall sampling for PIT-tagged juvenile salmonids with mid-water and
    shoreline Matrix style antennas ended on 30 October 2008 due to low
    densities of PIT-tagged fish in the upper estuary.  From 29 September to
    30 October we sampled for 59 hours and detected 3 PIT-tagged Chinook
    salmon.  Additionally, detections of PIT-tagged fish at Lower Granite
    Dam and Bonneville Dam remained low during this period.  No further
    sampling will be conducted in 2008.
10/22/2008 13:34 Bob_Magi
    Sampling for PIT-tagged juvenile salmonids in the Columbia River estuary
    was discontinued with rising water temperatures and lower detection
    rates on 20 August 2008.  We re-initiated sampling, using one daily
    shift, on a biweekly basis on 29 September 2008.  Both mid-river (MWF)
    and shoreline (TT) sampling are anticipated using Matrix-style
    antennas.  We expect to continue sampling with this schedule through 31
    October and evaluate detection results before continuing.  Detections of
    PIT-tagged fish at Bonneville Dam and Lower Granite Dam and numbers of
    transported fish will be monitored to help evaluate potential PIT-tagged
    fish availability in the estuary.
09/23/2008 14:39 Bob_Magi
    Sampling with the Matrix pair-trawl system for PIT-tagged juvenile
    salmonids in the Columbia River estuary was suspended on 20 August.
    Availability of PIT-tag fish in the sample area near river kilometer 75
    decreased through the August as water temperatures in the basin increased.

    We sampled for a total of 980 hours between 7 March and 20 August and
    detected 16,560 PIT-tagged salmonids.  During the peak of the spring
    migration period we sampled with two daily crews (30 April-14 June) and
    detected 2.6% of the 77,563 PIT-tagged fish previously detected at
    Bonneville Dam.  This rough measure of sample efficiency included
    detections from 3-days of simultaneous operation of the new Matrix
    antenna system (8.5 foot wide by 10-foot tall) and the older Electric
    barge antenna system (3-foot-diameter).  Detections with the Matrix were
    substantially improved over the older system and was used exclusively
    since 15 May.  Given the higher than average flows and extreme debris
    loads in 2008 which cost lost sample time and efficiency, the improved
    new system we believe allowed us to meet the 2 to 3% annual sample
    efficiency goal.
06/06/2008 10:48 Dave
    The DMBS server crashed yesterday as interrogation data files were being
    processed.  The appropriate steps were taken to restart the DBMS and
    recover unprocessed data records and their source files.  As part of the
    recovery process, most of the outstanding data files were processed
    yesterday afternoon.  The remaining 15 files were processed this morning.
     This included one file each from GOJ, MC2, MCJ, RIA, SUJ, VC1, VC2, and
    WEA, four files from TWX, and three files from WFF.
03/14/2008 15:56 Dick_Led
    TWX Site Event 2008 open season entry (11 Mar 08).

    Sampling will occur between river kilometer 61 to 83 (site code TWX)
    using a surface pair trawl beginning 7 March.  A 2-coil, in series,
    detection antenna will be used.  This antenna used 2001-2005 and 2007,
    has a 3' diameter fish passage opening.  Sampling during in March and
    early April gradually increase from 2 to 5 days a week (about 5 or 6
    hours detector 'on-time' per day).  In late April, a second daily crew
    will be added and the sample increased to 7 days a week through late
    June (generally about 12 hours 'on-time' per day).  Comenserate with an
    expected decline in detection numbers in July, we will again gradulally
    reduce effort from 5 to 2 days per week into August.  Fall sampling (Oct
    and November) is possible and during this period we will also deploy a
    shore line sampling system.

    Developments continue with a 6-coil (3 front and 3 rear) 'Matrix'
    antenna system.  The fish passage opening of this system measures 8.5'
    wide by 10' tall. We are developing handling equipment (it weights over
    1,000 pounds), assessing its electronic performance in both low high
    fish density situations.  If the Matrix system proves satisfactory and
    is reliable, we intend to switch to that system entirely in early May.
01/01/2008 00:00 PTOC_Bot
    Annual log file initiation for TWX

         #### End of Event Log for TWX ###