Lower Granite Bypass and Spillway Analyses

Data Courtesy of U.S. Army Corps of Engineers, NWD and Pacific States Marine Fisheries Commission

PIT Tag Lower Granite Bypass and Spillway Queries

Lower Granite Bypass and Spillway Juvenile and Adult Daily Summary

Last Update: March 22 2026 07:25:02.

2026 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
	Outflow (daily avg) kcfs	Spill (daily avg) kcfs	Spill Hours All Bays	Spill Hours Spillbay 1	Percent Spill in Spillbay 1	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
	Outflow (daily avg) kcfs	Spill (daily avg) kcfs	Spill Hours All Bays	Spill Hours Spillbay 1	Percent Spill in Spillbay 1	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						20	36	5	40							95	15
2026-03-21	60.9	8.7	24	24	100.1	20	14	3	3							13
2026-03-20	61.1	0.0	1	1	22.0		13		8
2026-03-19	62.5	1.4	6	6	100.1		1		3							4
2026-03-18	61.1	0.0	0	0	0.0		2		7								1
2026-03-17	63.2	1.6	5	5	99.5		5	1	7							1	3
2026-03-16	66.2	0.0	0	0	0.0		1	1	2								1
2026-03-15	92.8	1.5	6	5	99.8				5							2	3
2026-03-14	88.1	0.0	0	0	0.0				3								3
2026-03-13	61.4	0.0	0	0	0.0				1
2026-03-12	42.2	1.6	6	5	100.4				1							3	2
2026-03-11	39.2	0.0	0	0	0.0
2026-03-10	35.3	1.5	6	5	100.5											11
2026-03-09	39.3	0.0	0	0	0.0
2026-03-08	38.4	2.0	5	5	100.1											16
2026-03-07	38.8	0.0	0	0	0.0
2026-03-06	40.7	0.0	0	0	0.0
2026-03-05	43.7	1.8	5	5	100.1											8
2026-03-04	34.7	0.0	0	0	0.0
2026-03-03	34.1	1.9	5	4	100.2											8
2026-03-02	34.3	0.0	0	0	0.0
2026-03-01	34.2	2.0	6	5	99.6											29
2026-02-28	42.1	0.0	0	0	0.0
2026-02-27	43.5	0.0	0	0	0.0
2026-02-26	43.3	0.0	0	0	0.0
2026-02-25	34.6	0.0	0	0	0.0
2026-02-24	36.1	0.0	0	0	0.0
2026-02-23	33.2	0.0	0	0	0.0
2026-02-22	27.8	0.0	0	0	0.0
2026-02-21	29.2	0.0	0	0	0.0
2026-02-20	32.0	0.0	0	0	0.0
2026-02-19	36.4	0.0	0	0	0.0
2026-02-18	27.2	0.0	0	0	0.0
2026-02-17	40.7	0.0	0	0	0.0
2026-02-16	30.7	0.0	0	0	0.0
2026-02-15	31.6	0.0	0	0	0.0
2026-02-14	33.7	0.0	0	0	0.0
2026-02-13	28.5	0.0	0	0	0.0
2026-02-12	30.6	0.0	0	0	0.0
2026-02-11	28.1	0.0	0	0	0.0
2026-02-10	31.5	0.0	0	0	0.0
2026-02-09	37.0	0.0	0	0	0.0
2026-02-08	29.7	0.0	0	0	0.0
2026-02-07	32.0	0.0	0	0	0.0
2026-02-06	26.9	0.0	0	0	0.0
2026-02-05	29.2	0.0	0	0	0.0
2026-02-04	26.7	0.0	0	0	0.0
2026-02-03	32.9	0.0	0	0	0.0
2026-02-02	30.8	0.0	0	0	0.0
2026-02-01	30.4	0.0	0	0	0.0
2026-01-31	34.4	0.0	0	0	0.0
2026-01-30	33.0	0.0	0	0	0.0
2026-01-29	30.7	0.0	0	0	0.0
2026-01-28	35.1	0.0	0	0	0.0
2026-01-27	35.1	0.0	0	0	0.0
2026-01-26	30.1	0.0	0	0	0.0
2026-01-25	34.9	0.0	0	0	0.0
2026-01-24	34.7	0.0	0	0	0.0
2026-01-23	35.5	0.0	0	0	0.0
2026-01-22	36.4	0.0	0	0	0.0
2026-01-21	40.9	0.0	0	0	0.0
2026-01-20	39.7	0.0	0	0	0.0
2026-01-19	40.4	0.0	0	0	0.0
2026-01-18	41.8	0.0	0	0	0.0
2026-01-17	41.7	0.0	0	0	0.0
2026-01-16	44.8	0.0	0	0	0.0
2026-01-15	42.6	0.0	0	0	0.0
2026-01-14	43.2	0.0	0	0	0.0
2026-01-13	45.0	0.1	2	2	57.8
2026-01-12	46.9	0.0	0	0	0.0
2026-01-11	43.1	0.0	0	0	0.0
2026-01-10	48.8	0.0	0	0	0.0
2026-01-09	51.2	0.0	0	0	0.0
2026-01-08	51.0	0.0	0	0	0.0
2026-01-07	45.8	0.0	0	0	0.0
2026-01-06	48.9	0.0	0	0	0.0
2026-01-05	51.4	0.0	0	0	0.0
2026-01-04	44.3	0.0	0	0	0.0
2026-01-03	46.7	0.0	0	0	0.0												1
2026-01-02	41.9	0.0	0	0	0.0												1
2026-01-01	40.4	0.0	0	0	0.0

Lower Granite Bypass and Spillway Juvenile Downstream Detections Summary by Species

Last Update: March 22 2026 07:25:02.

2026 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
Calendar Date	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 Total	20							36
2026-03-21	20							14
2026-03-20								13
2026-03-19								1
2026-03-18								2
2026-03-17								5
2026-03-16								1

2026 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
Calendar Date	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 Total	5							40	6	2
2026-03-21	3							3	3
2026-03-20								8	2
2026-03-19								3		1
2026-03-18								7
2026-03-17	1							7	1	1
2026-03-16	1							2
2026-03-15								5
2026-03-14								3
2026-03-13								1
2026-03-12								1

Query Notes

DART PIT Tag and ESU Metadata & Glossary