USGS Scientific Investigations Report 2009–5228Sediment Characteristics and Transport in the Kootenai River White Sturgeon Critical Habitat near Bonners Ferry, Idaho

Table 4. River discharge and bedload-sediment discharge, Kootenai River near Bonners Ferry, Idaho, water year 2008.

[Sampler: HS = 77×77 mm Helley-Smith with 3.22 exit ratio and 0.25 mm mesh bag; EL = 102×203 mm Elwha with 1.4 exit ratio and 0.50 mm mesh bag. Mean total load does not include particles less than 0.5 mm due to the partial recovery of that sediment. Abbreviations: mm, millimeter; m³/s, cubic meter per second; m/s, meter per second; m², square meter; m/m, meter per meter; <, less than; >, greater than; ≥, greater than or equal to; D, diameter; –, no data]

Date	Time	Discharge (m³/s)	Mean velocity (m/s)	Area (m²)	Top width (m)	Mean depth (m)	Water surface slope (m/m)	Sampler	Average particle size, in millimeters, at which the 35, 50, 65, and 90 percent by weight is finer				Fines to medium sand (<0.5 mm, metric tons per day)	Sand load (2 mm ≥ D >0.5 mm, metric tons per day)	Gravel load (≥2 mm, metric tons per day)	Mean total load (metric tons per day)
Date	Time	Discharge (m³/s)	Mean velocity (m/s)	Area (m²)	Top width (m)	Mean depth (m)	Water surface slope (m/m)	Sampler	D₃₅	D₅₀	D₆₅	D₉₀	Fines to medium sand (<0.5 mm, metric tons per day)	Sand load (2 mm ≥ D >0.5 mm, metric tons per day)	Gravel load (≥2 mm, metric tons per day)	Mean total load (metric tons per day)
Kootenai River below Moyie River—4842231161104
12-12-07	14:00	569	–	–	–	–	–	HS	<0.5	<0.5	<0.5	0.6	0.18	0.00	0.01	0.01
12-13-07	12:30	589	1.10	536	140	3.84	–	HS	<.5	<.5	<.5	.5	.82	.09	.01	.10
05-07-08¹	11:36	705	1.20	575	140	4.11	–	EL	.5	.6	.7	1	.82	1.91	2.60	4.51
05-08-08¹	16:56	765	1.20	575	140	4.11	0.000534	EL	0	0	0	0	.01	.01	.01	.02
05-18-08	08:46	1,310	1.88	695	140	4.97	.000552	HS	.6	6.5	13	25	35.40	71.70	142.00	214.00
06-01-08	09:40	1,020	1.62	626	139	4.51	.000530	EL	9	10	14	20	.09	1.72	4.55	6.27
06-02-08	15:03	1,210	1.78	679	142	4.79	.000537	HS	2.3	4.5	10	30	16.30	47.20	97.10	144.00
06-04-08	09:15	988	1.58	627	139	4.51	.000534	HS	<.5	<.5	<.5	2.3	9.98	2.27	1.53	3.80
06-11-08	10:27	1,050	1.62	649	140	4.66	.000537	EL	.8	1.3	8.2	20	.09	1.18	1.02	2.20
06-12-08	15:02	1,030	1.62	637	138	4.60	.000537	EL	5.1	13	19	40	.09	1.72	2.91	4.63
Kootenai River below Fry Creek—12309490
12-13-07	14:29	592	0.99	597	200	2.99	0.000307	HS	<0.5	<0.5	<0.5	0.5	0.01	0.01	0.01	0.02
05-07-08¹	16:38	719	1.19	579	195	2.97	.000395	EL	14.0	18.0	21.0	24.0	.36	36.30	36.20	72.50
05-08-08¹	14:29	748	1.19	579	195	2.97	.000375	EL	13.0	16.0	18.0	29.0	.64	24.50	24.00	48.50
05-17-08	13:33	1,140	–	–	–	–	.000130	HS	<.5	4.1	19.0	25.0	14.50	20.00	18.10	38.10
05-18-08	12:01	1,310	1.12	1,140	207	5.55	.000116	HS	<.5	4.7	7.8	12.0	7.44	9.07	8.75	17.80
06-01-08	13:44	895	.94	957	208	4.60	.000117	EL	5.8	6.4	7.0	8.2	.01	.36	.32	.68
06-03-08	11:38	1,130	1.02	1,110	209	5.30	.000134	HS	<.5	<.5	<.5	<.5	3.27	.27	.07	.34
06-11-08	14:55	1,000	1.04	966	207	4.66	.000137	EL	.6	.7	.8	1.5	.09	.09	.01	.10
06-13-08	08:00	1,020	1.05	966	205	4.69	.000117	EL	.5	.6	.7	1.2	.09	.18	.01	.19
Kootenai River above Shorty's Island—4845421162319
12-14-07	09:00	671	–	–	–	–	0.0000310	HS	–	–	–	–	–	–	–	–
05-16-08²	15:03	963	–	–	–	–	–	EL	0.5	0.7	0.8	1.3	3.54	6.08	0.01	6.09
05-31-08	15:53	963	0.65	1,490	228	6.49	.0000260	EL	.6	.7	.8	1.3	0.54	1.72	.03	1.75
06-02-08	10:46	1,240	.76	1,640	236	6.95	.0000310	EL	.5	.6	.7	1.2	4.54	7.26	.09	7.35
06-03-08	16:00	1,160	.71	1,640	237	6.95	.0000290	HS	–	–	–	–	–	–	–	–
06-12-08	09:27	1,040	.68	1,520	234	6.49	.0000290	EL	.5	.6	.7	1.2	2.00	2.99	.04	3.03

¹ Velocity, area, width, and depth estimated from acoustic Doppler current profiler measurement on 05-09-2008.

² D₃₅ averaged with data less than 0.5 mm.