Lower Granite Bypass and Spillway Analyses

Data Courtesy of Pacific States Marine Fisheries Commission

PIT Tag Lower Granite Bypass and Spillway Analysis

Lower Granite Bypass and Spillway Juvenile and Adult Daily Summary

Last Update: April 04 2025 07:25:21.
2025 Lower Granite Spillway (GRS) and Bypass (GRJ) Juvenile and Adult Daily Detection Summary
Water and Fish daily averages and totals calculated from hourly timestamps in Pacific Time with daylight savings
Calendar Date Spill Conditions Juveniles Adults
Outflow
(daily avg)
kcfs
Spill
(daily avg)
kcfs
Spill Hours
All Bays
Spill Hours
Spillbay 1
Percent Spill
in
Spillbay 1
Chinook Steelhead Coho Sockeye Chinook Steelhead Coho Sockeye
Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ)
Calendar Date Spill Conditions Juveniles Adults
Outflow
(daily avg)
kcfs
Spill
(daily avg)
kcfs
Spill Hours
All Bays
Spill Hours
Spillbay 1
Percent Spill
in
Spillbay 1
Chinook Steelhead Coho Sockeye Chinook Steelhead Coho Sockeye
Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ) Spillway (GRS)Bypass (GRJ)
YTD Total     114635618992503120120    11128    
2025-04-0372.857.02441.79279159932     5     
2025-04-0275.66.5242499.010641015246624    53    
2025-04-0184.56.62424100.01305071656111411    35    
2025-03-3180.67.02424100.020810131466382223    71    
2025-03-3091.47.12424100.030410641754042829    83    
2025-03-2997.67.92424100.143212211662141    33    
2025-03-2891.48.52424100.011518233583012    33    
2025-03-2783.99.5242499.957551527      42    
2025-03-2673.89.62424100.12481418      51    
2025-03-2559.28.8242499.8288146      5     
2025-03-2456.48.52424100.09629      4     
2025-03-2352.99.3242499.9111        3     
2025-03-2251.19.1242499.921        3     
2025-03-2150.19.22424100.012        1     
2025-03-2046.41.85699.81         12    
2025-03-1954.61.95499.9 4 1      41    
2025-03-1853.11.954100.2 1 1      4     
2025-03-1755.61.75499.322 1       1    
2025-03-1648.31.755100.331        1     
2025-03-1549.81.75599.62  1      21    
2025-03-1453.81.755100.231 1            
2025-03-1354.01.854100.41  1      22    
2025-03-1251.22.166100.014211           
2025-03-1145.81.96699.7          2     
2025-03-1048.21.96699.9          2     
2025-03-0948.82.266100.0                
2025-03-0845.02.26699.6  1       3     
2025-03-0744.72.066100.01         1     
2025-03-0646.32.25699.9          1     
2025-03-0553.42.156100.01         6     
2025-03-0451.22.04599.9          5     
2025-03-0350.12.25599.7          2     
2025-03-0249.32.25599.61         4     
2025-03-0147.92.25599.8          12     
2025-02-2847.90.0000.0                
2025-02-2741.70.0000.0                
2025-02-2653.20.0000.0                
2025-02-2557.20.0000.0                
2025-02-2456.70.0000.0                
2025-02-2333.60.0000.0                
2025-02-2232.20.0000.0                
2025-02-2132.50.0000.0                
2025-02-2028.30.0000.0                
2025-02-1923.00.0000.0                
2025-02-1820.00.0000.0                
2025-02-1731.50.0000.0                
2025-02-1631.90.0000.0                
2025-02-1526.60.0000.0                
2025-02-1426.70.0000.0                
2025-02-1333.30.0000.0                
2025-02-1235.50.0000.0                
2025-02-1139.30.0000.0                
2025-02-1033.30.0000.0                
2025-02-0935.70.0000.0                
2025-02-0833.00.0000.0                
2025-02-0729.40.0000.0                
2025-02-0623.70.0000.0                
2025-02-0530.80.0000.0                
2025-02-0431.60.0000.0                
2025-02-0332.00.0000.0                
2025-02-0227.20.0000.0                
2025-02-0132.20.0000.0                
2025-01-3126.60.0000.0                
2025-01-3025.20.0000.0                
2025-01-2924.70.0000.0                
2025-01-2827.00.0000.0                
2025-01-2729.50.0000.0                
2025-01-2628.00.0000.0                
2025-01-2527.40.0000.0                
2025-01-2427.80.0000.0                
2025-01-2328.10.0000.0                
2025-01-2229.50.0000.0                
2025-01-2128.90.0000.0                
2025-01-2031.60.0000.0                
2025-01-1930.50.0000.0                
2025-01-1834.40.0000.0                
2025-01-1732.30.0000.0                
2025-01-1630.20.0000.0                
2025-01-1532.60.0000.0                
2025-01-1435.10.0000.0                
2025-01-1334.10.0000.0                
2025-01-1238.30.0000.0                
2025-01-1135.80.0000.0                
2025-01-1035.10.0000.0                
2025-01-0936.60.0000.0                
2025-01-0840.70.0000.0                
2025-01-0739.80.0000.0                
2025-01-0635.00.0000.0                
2025-01-0535.60.0000.0                
2025-01-0432.70.0000.0                
2025-01-0332.10.0000.0                
2025-01-0230.90.0000.0                
2025-01-0127.40.0000.0                

Lower Granite Bypass and Spillway Juvenile Downstream Detections Summary by Species

Last Update: April 04 2025 07:26:12.

2025 Juvenile Chinook Downstream Detections
Fish daily totals calculated from hourly timestamps in Pacific Time with daylight savings
Calendar Date Spillway and then Downstream, Unique TagIDs Detected Bypass and then Downstream, Unique TagIDs Detected
Spillway (GRS) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville Bypass (GRJ) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville
YTD Total1146972216133 356117820226  
2025-04-03923  32 79141 2  
2025-04-0210619257  41045853  
2025-04-011302345 1 507594121  
2025-03-312087712  10132642   
2025-03-303041753   10641322   
2025-03-29431522   2121811   
2025-03-281158     182      
2025-03-275731    551     
2025-03-26241     82     
2025-03-2528      8      
2025-03-249   1  6      
2025-03-2311      1      
2025-03-2221     1      
2025-03-211      2      
2025-03-201 1           
2025-03-19       4      
2025-03-18       1      
2025-03-172      2      
2025-03-163      1      
2025-03-152             
2025-03-143      1      
2025-03-131             
2025-03-121      4      
2025-03-11              
2025-03-10              
2025-03-09              
2025-03-08              
2025-03-071             
2025-03-06              
2025-03-051             
2025-03-04              
2025-03-03              
2025-03-021             

2025 Juvenile Steelhead Downstream Detections
Fish daily totals calculated from hourly timestamps in Pacific Time with daylight savings
Calendar Date Spillway and then Downstream, Unique TagIDs Detected Bypass and then Downstream, Unique TagIDs Detected
Spillway (GRS) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville Bypass (GRJ) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville
YTD Total8991842161  2503548371271 
2025-04-03159212 1  9348324  
2025-04-021526343   4662621361  
2025-04-011657142   6111768211 
2025-03-3114674    638398 1  
2025-03-301751031   40482    
2025-03-292163    16672    
2025-03-283361    584     
2025-03-2715      272     
2025-03-2614      181     
2025-03-2514      6  2   
2025-03-242      9      
2025-03-23              
2025-03-22         1    
2025-03-21        1     
2025-03-20              
2025-03-19       1      
2025-03-18       1      
2025-03-17       1      
2025-03-16              
2025-03-15       1      
2025-03-14       1      
2025-03-13       1      
2025-03-122      1      
2025-03-11              
2025-03-10              
2025-03-09              
2025-03-081             

2025 Juvenile Coho Downstream Detections
Fish daily totals calculated from hourly timestamps in Pacific Time with daylight savings
Calendar Date Spillway and then Downstream, Unique TagIDs Detected Bypass and then Downstream, Unique TagIDs Detected
Spillway (GRS) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville Bypass (GRJ) Little Goose Lower Monumental Ice Harbor McNary John Day Bonneville
YTD Total1203     120      
2025-04-032             
2025-04-022      4      
2025-04-01143     11      
2025-03-3122      23      
2025-03-3028      29      
2025-03-2921      41      
2025-03-2830      12      
2025-03-27              
2025-03-26              
2025-03-25              
2025-03-24              
2025-03-23              
2025-03-22              
2025-03-21              
2025-03-20              
2025-03-19              
2025-03-18              
2025-03-17              
2025-03-16              
2025-03-15              
2025-03-14              
2025-03-13              
2025-03-121             
Query Notes