Lower Monumental Lock and Dam
From PTAGISWiki
Lower Monumental Lock and Dam, operated by the US Army Corps of Engineers, is located on the Snake River at River Mile 41.6 (River Kilometer 67) approximately 18 miles downstream from the confluence of the Snake and Palouse rivers at Lyon's Ferry. Construction was completed in 1969. Facilities include a powerhouse, spillway, navigation lock, two fish ladders, and a juvenile bypass system.
- Total Length: 3,791 feet (1,155 meters)
- Spillway Length: 572 feet (174 meters)
- Powerhouse Length: 656 feet (200 meters)
- Total Generation Capacity: 810 megawatts (6 generators)
- Normal Reservoir Elevation: 537-540 feet (164-165 meters) MSL
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Lower Monumental Dam Links
- US Army Corps of Engineers' sites
- Walla Walla District's Lower Monumental Dam Digital Project Notebook
- Walla Walla District's Lower Monumental Dam Pertinent Data
- Lower Monumental Dam Fact Sheet (pdf)
- Water Management Division's Lower Monumental Dam page
- Water Management Division's Dataquery tool - historic and current fish, hydrologic, water quality, weather and power generation datasets
- Hydroelectric Design Center Lower Monumental Dam information (pdf)
- Adult Fish Count Interactive Reports
- 2010 Fish Passage Plan
- Bonneville Power Administration's Lower Monumental Dam page
- Fish Passage Center's Lower Monumental Dam page
PIT Tag Interrogation Site Contacts
- Data Steward
- Dave Marvin - Columbia Basin PIT Tag Information System
Pacific States Marine Fisheries Commission - Technical POC
- Don Warf - Columbia Basin PIT Tag Information System
Pacific States Marine Fisheries Commission
PIT Tag Interrogation Site Location
PIT Tag Interrogation Site Details
LMJ - Lower Monumental Dam Juvenile Bypass System
The LMJ interrogation site has been in operation in the same location and with similar configuration since 1993. Separation by Code (SbyC), smolt monitoring and smolt transportation all occur at the Juvenile Monitoring Facility. All antennas were converted to ISO from 400 KHz during the winter of 1999-2000. See the site configuration history and the current site diagram for the antenna groups described below. For assistance in determining whether a PIT-tagged fish has been transported or not, refer to FAQ:Transport vs Bypass.
- Full Flow Bypass (01-04)
- Installed in 2007, this antenna group is located between the powerhouse and the juvenile monitoring facility and interrogates all PIT-tagged fish in the bypass system.
- A-Separator Gate (A1-A4)
- This antenna group interrogates PIT-tagged fish that are collected from the A-side of the fish and debris separator, and can trigger an SbyC slide gate. By default fish pass through the gate towards the A-Raceway antenna group. If the gate is triggered for a target by an SbyC tag, the fish will be diverted to the SbyC Sample Tanks.
- A-Diversion (31-33)
- This antenna group interrogates PIT-tagged fish that are diverted at the A-Separator Gate to the SbyC Sample Tanks.
- A-Raceway (11-13)
- This antenna group interrogates PIT-tagged fish that pass through the A-Separator and the facility sub-sample gates and are being routed to the raceways.
- B-Separator Gate (B1-B4)
- This antenna group interrogates PIT-tagged fish that are collected form the B-side of the fish and debris separator and can trigger an SbyC slide gate. By default fish pass through the gate towards the B-Raceway antenna group. If the gate is triggered for a target by an SbyC tag, the fish will be diverted to the SbyC Sample Tanks.
- B-Diversion (41-43)
- This antenna group interrogates PIT-tagged fish that are diverted at the B-Separator Gate to the SbyC Sample Tanks.
- B-Raceway (21-23)
- This antenna group interrogates PIT-tagged fish that pass through the B-Separator and the facility sub-sample gates and are being routed to the raceways.
- Diversion River Exit (91-93)
- This antenna group interrogates PIT-tagged fish that are released from the SbyC Sample Tanks and returned to the river.
- Sample Room (51-52)
- This antenna group interrogates PIT-tagged fish that are collected for a smolt monitoring sub-sample.
- A-Exit (81-82)
- This antenna group interrogates PIT-tagged fish from the A-side of the separator that are routed either towards the dock for direct barge load or are returned to the river, depending on the facility's operational mode.
- B-Exit (61-62)
- This antenna group interrogates PIT-tagged fish from the B-side of the separator that are routed either towards the dock for direct barge load or are returned to the river, depending on the facility's operational mode.
- Adult Fish Return (F1-F2)
- Installed in 2006, this antenna group interrogates PIT-tagged fish that are removed from the fish and debris separator and returned to the river.
- Annual Event Logs and Dates of Operation
- PTAGIS Field Operations LMJ Site Page
- Current Separation by Code Actions
- FAQ: How to determine if a PIT-tagged fish was transported
Site Configuration History
Config # Dates of Operation Antenna Group Antenna IDs 150 Mar 2007 - Present Full Flow Bypass 01 02 03 04 A-Separator Gate A1 A2 A3 A4 A-Diversion 31 32 33 A-Raceway 11 12 13 B-Separator Gate B1 B2 B3 B4 B-Diversion 41 42 43 B-Raceway 21 22 23 Diversion River Exit 91 92 93 Sample Room 51 52 A-Exit 81 82 B-Exit 61 62 Adult Fish Return F1 F2
Previous site configurations 140 Jan 2006 - March 2007 A-Separator Gate A1 A2 A3 A4 A-Diversion 31 32 33 A-Raceway 11 12 13 B-Separator Gate B1 B2 B3 B4 B-Diversion 41 42 43 B-Raceway 21 22 23 Diversion River Exit 91 92 93 Sample Room 51 52 A-Exit 81 82 B-Exit 61 62 Adult Fish Return F1 F2 130 Jan 2000 - Jan 2006 A-Separator Gate A1 A2 A3 A4 A-Diversion 31 32 33 A-Raceway 11 12 13 B-Separator Gate B1 B2 B3 B4 B-Diversion 41 42 43 B-Raceway 21 22 23 Diversion River Exit 91 92 93 Sample Room 51 52 A-Exit 81 82 B-Exit 61 62 120 Feb 1996 - Jan 2000 A-Separator Gate 00 02 04 06 A-Diversion 20 22 24 26 A-Raceway 10 12 14 16 B-Separator Gate 08 0A 0C 0E B-Diversion 28 2A 2C 2E B-Raceway 18 1A 1C 1E Diversion Exit 40 42 44 46 Sample Room 48 4A A-Exit 30 32 34 36 B-Exit 38 3A 3C 3E 110
100Apr 1993 - Feb 1996 A-Separator 00 02 A-Separator Gate 04 06 A-Diversion 20 22 24 26 A-Raceway 10 12 14 16 B-Separator 08 0A B-Separator Gate 0C 0E B-Diversion 28 2A 2C 2E B-Raceway 18 1A 1C 1E Diversion Exit 40 42 44 46 Sample Room 48 4A A-Exit 30 32 34 36 B-Exit 38 3A 3C 3E
