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
	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						1146	3561	899	2503	120	120					111	28
2025-04-03	72.8	57.0	24	4	1.7	92	79	159	93	2						5
2025-04-02	75.6	6.5	24	24	99.0	106	410	152	466	2	4					5	3
2025-04-01	84.5	6.6	24	24	100.0	130	507	165	611	14	11					3	5
2025-03-31	80.6	7.0	24	24	100.0	208	1013	146	638	22	23					7	1
2025-03-30	91.4	7.1	24	24	100.0	304	1064	175	404	28	29					8	3
2025-03-29	97.6	7.9	24	24	100.1	43	212	21	166	21	41					3	3
2025-03-28	91.4	8.5	24	24	100.0	115	182	33	58	30	12					3	3
2025-03-27	83.9	9.5	24	24	99.9	57	55	15	27							4	2
2025-03-26	73.8	9.6	24	24	100.1	24	8	14	18							5	1
2025-03-25	59.2	8.8	24	24	99.8	28	8	14	6							5
2025-03-24	56.4	8.5	24	24	100.0	9	6	2	9							4
2025-03-23	52.9	9.3	24	24	99.9	11	1									3
2025-03-22	51.1	9.1	24	24	99.9	2	1									3
2025-03-21	50.1	9.2	24	24	100.0	1	2									1
2025-03-20	46.4	1.8	5	6	99.8	1										1	2
2025-03-19	54.6	1.9	5	4	99.9		4		1							4	1
2025-03-18	53.1	1.9	5	4	100.2		1		1							4
2025-03-17	55.6	1.7	5	4	99.3	2	2		1								1
2025-03-16	48.3	1.7	5	5	100.3	3	1									1
2025-03-15	49.8	1.7	5	5	99.6	2			1							2	1
2025-03-14	53.8	1.7	5	5	100.2	3	1		1
2025-03-13	54.0	1.8	5	4	100.4	1			1							2	2
2025-03-12	51.2	2.1	6	6	100.0	1	4	2	1	1
2025-03-11	45.8	1.9	6	6	99.7											2
2025-03-10	48.2	1.9	6	6	99.9											2
2025-03-09	48.8	2.2	6	6	100.0
2025-03-08	45.0	2.2	6	6	99.6			1								3
2025-03-07	44.7	2.0	6	6	100.0	1										1
2025-03-06	46.3	2.2	5	6	99.9											1
2025-03-05	53.4	2.1	5	6	100.0	1										6
2025-03-04	51.2	2.0	4	5	99.9											5
2025-03-03	50.1	2.2	5	5	99.7											2
2025-03-02	49.3	2.2	5	5	99.6	1										4
2025-03-01	47.9	2.2	5	5	99.8											12
2025-02-28	47.9	0.0	0	0	0.0
2025-02-27	41.7	0.0	0	0	0.0
2025-02-26	53.2	0.0	0	0	0.0
2025-02-25	57.2	0.0	0	0	0.0
2025-02-24	56.7	0.0	0	0	0.0
2025-02-23	33.6	0.0	0	0	0.0
2025-02-22	32.2	0.0	0	0	0.0
2025-02-21	32.5	0.0	0	0	0.0
2025-02-20	28.3	0.0	0	0	0.0
2025-02-19	23.0	0.0	0	0	0.0
2025-02-18	20.0	0.0	0	0	0.0
2025-02-17	31.5	0.0	0	0	0.0
2025-02-16	31.9	0.0	0	0	0.0
2025-02-15	26.6	0.0	0	0	0.0
2025-02-14	26.7	0.0	0	0	0.0
2025-02-13	33.3	0.0	0	0	0.0
2025-02-12	35.5	0.0	0	0	0.0
2025-02-11	39.3	0.0	0	0	0.0
2025-02-10	33.3	0.0	0	0	0.0
2025-02-09	35.7	0.0	0	0	0.0
2025-02-08	33.0	0.0	0	0	0.0
2025-02-07	29.4	0.0	0	0	0.0
2025-02-06	23.7	0.0	0	0	0.0
2025-02-05	30.8	0.0	0	0	0.0
2025-02-04	31.6	0.0	0	0	0.0
2025-02-03	32.0	0.0	0	0	0.0
2025-02-02	27.2	0.0	0	0	0.0
2025-02-01	32.2	0.0	0	0	0.0
2025-01-31	26.6	0.0	0	0	0.0
2025-01-30	25.2	0.0	0	0	0.0
2025-01-29	24.7	0.0	0	0	0.0
2025-01-28	27.0	0.0	0	0	0.0
2025-01-27	29.5	0.0	0	0	0.0
2025-01-26	28.0	0.0	0	0	0.0
2025-01-25	27.4	0.0	0	0	0.0
2025-01-24	27.8	0.0	0	0	0.0
2025-01-23	28.1	0.0	0	0	0.0
2025-01-22	29.5	0.0	0	0	0.0
2025-01-21	28.9	0.0	0	0	0.0
2025-01-20	31.6	0.0	0	0	0.0
2025-01-19	30.5	0.0	0	0	0.0
2025-01-18	34.4	0.0	0	0	0.0
2025-01-17	32.3	0.0	0	0	0.0
2025-01-16	30.2	0.0	0	0	0.0
2025-01-15	32.6	0.0	0	0	0.0
2025-01-14	35.1	0.0	0	0	0.0
2025-01-13	34.1	0.0	0	0	0.0
2025-01-12	38.3	0.0	0	0	0.0
2025-01-11	35.8	0.0	0	0	0.0
2025-01-10	35.1	0.0	0	0	0.0
2025-01-09	36.6	0.0	0	0	0.0
2025-01-08	40.7	0.0	0	0	0.0
2025-01-07	39.8	0.0	0	0	0.0
2025-01-06	35.0	0.0	0	0	0.0
2025-01-05	35.6	0.0	0	0	0.0
2025-01-04	32.7	0.0	0	0	0.0
2025-01-03	32.1	0.0	0	0	0.0
2025-01-02	30.9	0.0	0	0	0.0
2025-01-01	27.4	0.0	0	0	0.0

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
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	1146	97	22	16	13	3		3561	178	20	22	6
2025-04-03	92	3			3	2		79	14	1		2
2025-04-02	106	19	2	5	7			410	45	8	5	3
2025-04-01	130	23	4	5		1		507	59	4	12	1
2025-03-31	208	7	7	1	2			1013	26	4	2
2025-03-30	304	17	5	3				1064	13	2	2
2025-03-29	43	15	2	2				212	18	1	1
2025-03-28	115	8						182
2025-03-27	57	3	1					55	1
2025-03-26	24	1						8	2
2025-03-25	28							8
2025-03-24	9				1			6
2025-03-23	11							1
2025-03-22	2	1						1
2025-03-21	1							2
2025-03-20	1		1
2025-03-19								4
2025-03-18								1
2025-03-17	2							2
2025-03-16	3							1
2025-03-15	2
2025-03-14	3							1
2025-03-13	1
2025-03-12	1							4
2025-03-11
2025-03-10
2025-03-09
2025-03-08
2025-03-07	1
2025-03-06
2025-03-05	1
2025-03-04
2025-03-03
2025-03-02	1

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
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	899	184	21	6	1			2503	548	37	12	7	1
2025-04-03	159	21	2		1			93	48	3	2	4
2025-04-02	152	63	4	3				466	262	13	6	1
2025-04-01	165	71	4	2				611	176	8	2	1	1
2025-03-31	146	7	4					638	39	8		1
2025-03-30	175	10	3	1				404	8	2
2025-03-29	21	6	3					166	7	2
2025-03-28	33	6	1					58	4
2025-03-27	15							27	2
2025-03-26	14							18	1
2025-03-25	14							6			2
2025-03-24	2							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
2025-03-12	2							1
2025-03-11
2025-03-10
2025-03-09
2025-03-08	1

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
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	120	3						120
2025-04-03	2
2025-04-02	2							4
2025-04-01	14	3						11
2025-03-31	22							23
2025-03-30	28							29
2025-03-29	21							41
2025-03-28	30							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
2025-03-12	1

Query Notes

DART PIT Tag and ESU Metadata & Glossary