Lower Columbia River Forebay Temperature Monitoring Phase 1 and Phase 2 Scope of Work – Purpose There is regional interest in more rigorous monitoring of water temperatures in the forebays and within the fish ladders of the three Lower Columbia River (LCR) Dams - John Day, The Dalles and Bonneville. This stems from concerns regarding fish ladder water temperature differentials and subsequent delayed migration of adult salmonids. A water temperature data collection effort is currently being carried out by the Walla Walla District to monitor conditions at the lower four Snake River Dams and McNary Dam; efforts should be standardized across both Districts to the extent possible. Current Water Temperature Monitoring Water temperatures are currently monitored at the LCR dams mid-fish ladder as well as upstream and downstream of each dam at the Total Dissolved Gas (TDG) Fixed Monitoring Stations (FMS) (Table 1). 1. LCR ID Monitor Type Location JDAAN1 Hobo Temperature Monitor North Exit Pool JDAAN2 Hobo Temperature Monitor North Entrance Pool JDAAS1 Hobo Temperature Monitor South Exit Pool JDAAS2 Hobo Temperature Monitor South Entrance Pool JDY TDG Temperature Monitor Forebay Temperature JHAW TDG Temperature Monitor Tailwater Temperature TDAAN1 Hobo Temperature Monitor North Ladder Count Station TDAAE1 (TDA) TDG Temperature Monitor Forebay Temperature TDDO TDG Temperature Monitor Tailwater Temperature TDAAE2 Hobo Temperature Monitor East Ladder Count Station BONAB1 Temperature Monitor Bradford Island Count Station BONAN1 Temperature Monitor Washington Shore Count Station BONAN2 Temperature Monitor Washington Shore Adult Fish Facility downstream return pool BONAL1 Temperature Monitor Bradford Island Lamprey Passage Structure, near exit BONAL2 Temperature Monitor Cascade Island Lamprey Passage Structure BONAL3 Temperature Monitor Washington Auxiliary Water Supply Lamprey Passage Structure BONAL4 Temperature Monitor Washington North Downstream Entrance Lamprey Flume/Passage System BON TDG Temperature Monitor Forebay Temperature CCIW TDG Temperature Monitor Tailwater Temperature WRNO TDG Temperature Monitor Tailwater Temperature
Lower Columbia River Forebay Temperature Monitoring – Phase 1 and Phase 2 Scope of Work Purpose There is regional interest in more rigorous monitoring of water temperatures in the forebays and within the fish ladders of the three Lower Columbia River (LCR) Dams - John Day, The Dalles and Bonneville. This stems from concerns regarding fish ladder water temperature differentials and subsequent delayed migration of adult salmonids. A water temperature data collection effort is currently being carried out by the Walla Walla District to monitor conditions at the lower four Snake River Dams and McNary Dam; efforts should be standardized across both Districts to the extent possible. Current Water Temperature Monitoring Water temperatures are currently monitored at the LCR dams mid-fish ladder as well as upstream and downstream of each dam at the Total Dissolved Gas (TDG) Fixed Monitoring Stations (FMS) (Table 1). 1. LCR ID Monitor Type Location JDAAN1 Hobo Temperature Monitor North Exit Pool JDAAN2 Hobo Temperature Monitor North Entrance Pool JDAAS1 Hobo Temperature Monitor South Exit Pool JDAAS2 Hobo Temperature Monitor South Entrance Pool JDY TDG Temperature Monitor Forebay Temperature JHAW TDG Temperature Monitor Tailwater Temperature TDAAN1 Hobo Temperature Monitor North Ladder Count Station TDAAE1 (TDA) TDG Temperature Monitor Forebay Temperature TDDO TDG Temperature Monitor Tailwater Temperature TDAAE2 Hobo Temperature Monitor East Ladder Count Station BONAB1 Temperature Monitor Bradford Island Count Station BONAN1 Temperature Monitor Washington Shore Count Station BONAN2 Temperature Monitor Washington Shore Adult Fish Facility downstream return pool BONAL1 Temperature Monitor Bradford Island Lamprey Passage Structure, near exit BONAL2 Temperature Monitor Cascade Island Lamprey Passage Structure BONAL3 Temperature Monitor Washington Auxiliary Water Supply Lamprey Passage Structure BONAL4 Temperature Monitor Washington North Downstream Entrance Lamprey Flume/Passage System BON TDG Temperature Monitor Forebay Temperature CCIW TDG Temperature Monitor Tailwater Temperature WRNO TDG Temperature Monitor Tailwater Temperature