USGS Scientific Investigations Report 2010–5065Channel Change and Bed-Material Transport in the Lower Chetco River, Oregon

Table 4. Sediment sampling locations used in the sediment transport study, Chetco River, Oregon.

[Samples collected September 15–19, 2008, using methods of Wolman (1954). Unless otherwise noted, samples were collected at bar apices. Location names are informal descriptions of bars based on local landmarks. Eastings and northings are in meters and refer to the UTM zone 10 projection using the North American Datum of 1983. Grain-size diameter: d₁₆, grain-size diameter in millimeters, where 16 percent of the sample is finer by volume; d₅₀, grain size diameter in millimeters, where 50 percent of the sample is finer by volume; d₈₄, grain size diameter in millimeters, where 84 percent of the sample is finer by volume]

Sample identification No.	Location	River kilometer	Flood-plain kilometer	Easting	Northing	Sample type	Grain-size diameter
Sample identification No.	Location	River kilometer	Flood-plain kilometer	Easting	Northing	Sample type	d₁₆	d₅₀	d₈₄
1a	Fitzhugh Bar	17.4	16.3	402185	4664607	Surface	7.76	47.19	103.57
						Suubsrface	2.27	31.08	121.87
1b	Fitzhugh Bar; mid-bar	17.3	16.0	402067	4664588	Surface	10.00	31.72	72.21
1c	Fitzhugh Bar; bar toe	17.0	15.5	401898	4664363	Surface	16.73	40.91	74.54
2	Second Bridge Bar	16.7	15.1	401900	4664111	Surface	11.52	28.87	57.42
3	Emily Creek Bar	14.5	13.2	401916	4663279	Surface, tributary	7.08	22.14	47.00
4	Loeb Park Bar	14.3	13.0	401955	4662994	Surface	17.98	37.15	63.07
5	Tamba Bar	12.4	11.3	401353	4661413	Surface	10.14	36.33	72.13
6	Mill Creek Bar	10.5	9.5	401281	4659622	Surface	20.95	53.26	89.40
7	Freeman Bar	8.6	7.8	400003	4658583	Surface	24.26	57.83	101.94
8	North Fork Bar	8.3	7.6	399729	4658916	Surface, tributary	16.24	39.22	96.55
10a	Social Security Bar	6.7	6.1	398602	4657732	Surface	14.21	39.72	85.94
						Subsurface	1.51	19.01	59.43
9	Jack Creek Bar	6.5	5.9	398949	4657514	Surface, tributary	15.38	31.43	70.50
10b	Social Security Bar; mid-bar	6.3	5.6	398249	4657614	Surface	4.32	18.89	39.48
10c	Social Security Bar; bar toe	6.0	5.4	397969	4657655	Surface	10.10	19.75	37.96
11	Tide Rock Bar	5.1	4.4	397114	4657964	Surface	6.15	23.88	58.76
12a	Tidewater Estuary Bar	3.5	3.0	396039	4658364	Surface	1.80	17.26	45.00
						Subsurface	.89	7.17	31.29
12b	Tidewater Estuary Bar; mid-bar	3.4	2.9	395999	4658335	Surface	3.87	16.18	38.50
12c	Tidewater Estuary Bar; bar toe	3.3	2.8	395903	4658268	Surface	3.45	11.91	28.42