USGS Scientific Investigations Report 2011–5041 - Channel Change and Bed-Material Transport in the Umpqua River Basin, Oregon

Table 2. U.S. Geological Survey streamflow-gaging stations in the Umpqua River, Oregon, used in peak flow analysis.

[p value from two-tailed, nonparametic Kendall’s tau test to evaluate whether historical declines in peak flows are statistically significant; significance level set at 5 percent (p<0.025 or p>0.975). Abbreviations: km², square kilometer; m, meter; <, less than; >, greater than]

Station  name	StationNo.	Period of analysis (water years)	Number of years	p value	Drainage area (km²)	Gage elevation (m)	Mean basin elevation (m)
South Umpqua River at Tiller	14308000	1940–2009	70	0.29	1,163	302	978
Elk Creek near Drew	14308500	1955–2009	55	0.26	141	390	878
West Fork Cow Creek near Glendale	14309500	1956–2009	54	0.02	225	310	738
Lookingglass Creek at Brockway	14311500	1956–1987	32	0.00	409	165	418
South Umpqua near Brockway	14312000	1942–2009	68	0.03	4,325	141	698
North Umpqua River above Copeland Creek near Toketee Falls	14316500	1950–2009	60	0.21	1,230	482	1,472
Steamboat Creek near Glide	14316700	1956–2009	54	0.09	588	344	945
Little River at Peel	14318000	1955–1989	35	0.08	458	252	860
North Umpqua River at Winchester	14319500	1954–2009	56	0.01	3,481	114	1,006
Calapooya Creek near Oakland	14320700	1956–1980	25	0.01	544	113	415
Umpqua River near Elkton	14321000	1906–2009	104	0.88	9,539	28	747