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 19 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						8815	4757	12113	3499	88	30					254	40
2026-04-18	73.6	60.8	24	24	13.7	692	146	336	45	5						4
2026-04-17	77.5	64.8	24	24	12.6	487	123	906	60	6	1					4	1
2026-04-16	80.5	67.7	24	24	11.8	573	465	1401	539	1	1					8
2026-04-15	76.1	63.3	24	17	8.8	646	113	698	55							7	1
2026-04-14	78.7	66.0	24	24	11.8	562	75	811	53	4						7
2026-04-13	76.1	63.5	24	24	12.0	840	66	654	49	1	1					10
2026-04-12	70.4	57.8	24	24	13.6	525	46	1423	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	67.2	54.8	24	24	13.8	233	34	83	15	2						4
2026-04-04	71.7	59.0	24	24	13.3	118	29	67	17	3						6
2026-04-03	73.8	60.5	24	24	13.0	104	47	121	61	1						5
2026-04-02	69.5	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 19 2026 07:25:04.

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	8815	301	116	101	67	31	28	4757	558	119	138	132	41	33
2026-04-18	692	6	13	5	9	1	3	146		1		3	5	10
2026-04-17	487	6	25	10	4	1	2	123	1	3		3	3	6
2026-04-16	573	14	6	8	1			465	1	2	3	6	5
2026-04-15	646	13	3	2	4		1	113	3		3	10	3	4
2026-04-14	562	9	2	6	3		1	75	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	12113	691	198	165	211	31	44	3499	594	111	74	237	27	46
2026-04-18	336	17	20	30	19	6	14	45	5	3		10	2	3
2026-04-17	906	13	46	20	6		2	60	9	6	1	5	2	4
2026-04-16	1401	23	17	17	7	3	7	539	10	2	4	5	3	1
2026-04-15	698	45	8	12	9	2	4	55	29	1	3	6	3	8
2026-04-14	811	24	10	11	5	4	6	53	11	3	3	12	2	7
2026-04-13	654	23	7	8	5	1	8	49	10	3	3	2		6
2026-04-12	1423	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	88	3	1					30	1
2026-04-18	5
2026-04-17	6							1
2026-04-16	1							1
2026-04-15
2026-04-14	4
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