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: April 15 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						6399	3904	8617	2794	75	28					231	38
2026-04-14	78.7	66.0	24	24	11.8	544	69	773	50	3						7
2026-04-13	76.1	63.5	24	24	12.0	840	66	554	46	1	1					10
2026-04-12	70.4	57.8	24	24	13.6	525	46	1406	45	2	1					3	1
2026-04-11	63.9	51.4	24	24	15.5	508	61	1127	64	2	1					6
2026-04-10	66.2	53.8	24	24	14.9	444	54	305	32	2						12	1
2026-04-09	65.5	53.0	24	24	15.5	382	29	378	49	2	1					9
2026-04-08	63.8	51.1	24	24	15.6	251	34	661	47	1						9
2026-04-07	65.0	52.6	24	24	14.7	314	17	1162	58							2
2026-04-06	66.8	54.3	24	24	14.1	319	22	229	21							8
2026-04-05	68.2	55.9	24	24	13.8	233	34	83	15	2						4
2026-04-04	71.9	59.0	24	24	13.3	118	29	67	17	3						6
2026-04-03	74.1	58.8	24	24	13.0	104	47	121	61	1						5
2026-04-02	68.3	7.9	24	24	99.7	233	544	121	312		2					3	2
2026-04-01	68.3	8.0	24	24	99.9	264	533	224	337	9	1					6	1
2026-03-31	74.7	8.2	24	24	100.0	344	529	496	446	15	1					3
2026-03-30	79.2	9.1	24	24	100.2	147	394	442	557	7	6					6	1
2026-03-29	73.0	9.7	24	24	100.0	246	344	359	431	22	8					7	4
2026-03-28	74.7	8.9	24	24	100.0	120	299	55	124	3	2					5	3
2026-03-27	84.7	8.9	24	24	100.0	85	184	24	16		2					7	2
2026-03-26	81.7	9.7	24	24	99.9	28	163	5	6		2					4	3
2026-03-25	69.1	8.9	24	24	100.0	81	173	3	6							5	4
2026-03-24	70.3	9.4	24	24	100.2	115	95	10	5							5
2026-03-23	73.9	8.8	24	24	100.0	90	52	3	5							1
2026-03-22	78.2	9.2	24	24	100.0	41	46	4	4							3	1
2026-03-21	61.2	9.2	24	24	100.1	23	18	3	3							13
2026-03-20	61.4	0.0	1	1	22.0		13		8
2026-03-19	66.3	1.9	6	6	100.1		1		3							4
2026-03-18	59.7	0.0	0	0	0.0		2		7								1
2026-03-17	64.4	2.1	5	5	99.5		5	1	7							1	3
2026-03-16	66.6	0.0	0	0	0.0		1	1	2								1
2026-03-15	94.1	2.0	6	5	99.8				5							2	3
2026-03-14	92.3	0.0	0	0	0.0				3								3
2026-03-13	64.9	0.0	0	0	0.0				1
2026-03-12	48.9	2.1	6	5	100.4				1							3	2
2026-03-11	45.7	0.0	0	0	0.0
2026-03-10	39.2	1.9	6	5	100.5											11
2026-03-09	42.6	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: April 15 2026 07:25:03.

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	6399	259	68	76	49	29	22	3904	553	113	132	110	25	13
2026-04-14	544	6	1	6	3		1	69	4	3	11	6
2026-04-13	840	3	1	4	4		2	66		3	19	15	1	2
2026-04-12	525	5	3	7	3			46	2	3	14	7		2
2026-04-11	508		7	11	1			61	3	8	15	7	1	1
2026-04-10	444	6	3	7	7	1	1	54	3	1	8	11	3
2026-04-09	382	1		7	4	3	2	29	5	3	17	25	4	1
2026-04-08	251	1		6	6	3		34	5	6	13	14	2	2
2026-04-07	314	6	2	7	7	3	3	17	6	13	13	9	2	1
2026-04-06	319	5	5		3		3	22	8	4	1	3	2
2026-04-05	233	9	3		3	2	3	34	24	2	2	3	3
2026-04-04	118	12	2	1	4	4	2	29	17	6	1	4		1
2026-04-03	104	12	4		1	1		47	31	6	2	3	1
2026-04-02	233	56	7	5	1	4	2	544	133	24	5	2	2
2026-04-01	264	46	13	3		3	1	533	136	16	4	1	1	1
2026-03-31	344	32	2	5	2	2	1	529	87	7	1		2	1
2026-03-30	147	9	5			2	1	394	35	3	1		1	1
2026-03-29	246	24	4			1		344	25	2	1
2026-03-28	120	4	3	1				299	12	1	1
2026-03-27	85	4	2	4				184	6		1
2026-03-26	28	7	1	1				163	2
2026-03-25	81	5		1				173	6	1	2
2026-03-24	115	3						95	3	1
2026-03-23	90	3						52
2026-03-22	41							46
2026-03-21	23							18
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	8617	590	107	86	170	20	17	2794	541	98	65	211	17	30
2026-04-14	773	21	10	11	5	4	6	50	11	2	2	12	2	7
2026-04-13	554	23	7	8	5	1	8	46	10	3	3	2		6
2026-04-12	1406	23	9	7	8	2		45	21	3	6	7	1	8
2026-04-11	1127	24	5	4	8	3	2	64	9	1	6	9	2	1
2026-04-10	305	38	1	3	22	3		32	12	5	2	29	1
2026-04-09	378	22	4	4	39	1		49	12	7	3	51	3	2
2026-04-08	661	13	3	9	23	3	1	47	14	4	4	28	2
2026-04-07	1162	6	5	12	35	2		58	12	4	6	49	3
2026-04-06	229	22	4	8	10			21	25	3	3	7
2026-04-05	83	23	5	10	6	1		15	24	4	11	4		2
2026-04-04	67	27	7	4	6			17	32	7	4	7		2
2026-04-03	121	71	9	1	1			61	56	9		3		1
2026-04-02	121	131	22	3	2			312	123	21	2	1	2
2026-04-01	224	86	10					337	101	6	1			1
2026-03-31	496	44	1					446	51		1		1
2026-03-30	442	9	1	1				557	7		1	2
2026-03-29	359		2					431	2	1	4
2026-03-28	55		1	1				124		2	3
2026-03-27	24	4						16	1	7	1
2026-03-26	5	2						6	1	3	2
2026-03-25	3		1					6	1	2
2026-03-24	10	1						5	3	1
2026-03-23	3							5	6	1
2026-03-22	4							4	1
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

2026 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
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	75	3	1					28	1
2026-04-14	3
2026-04-13	1							1
2026-04-12	2							1
2026-04-11	2							1
2026-04-10	2
2026-04-09	2		1					1
2026-04-08	1
2026-04-07
2026-04-06		1
2026-04-05	2
2026-04-04	3	2
2026-04-03	1
2026-04-02								2	1
2026-04-01	9							1
2026-03-31	15							1
2026-03-30	7							6
2026-03-29	22							8
2026-03-28	3							2
2026-03-27								2
2026-03-26								2

Query Notes

DART PIT Tag and ESU Metadata & Glossary