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

Table 11. Estimated bed-material flux values for the Umpqua and South Umpqua Rivers, Oregon, as calculated from surveys at mined sites, transport capacity equations, sediment yield analysis, and suspended sediment measurements.

[Survey data provided by gravel operators (Joy Smith, Umpqua Sand and Gravel, written commun., 2009, and Mike Flewelling, Knife River Corporation, written commun., 2009) and converted to mass using a bulk density of 2.1 metric tons/cubic meter based on data collected by Milhouse (2001) and presented in Bunte and Abt (2001). Deposition rate: Derived from surveyed raw fill values are denoted as (rfv) where this data are available, otherwise the net deposition volume is provided. See table 8 for complete survey data. Bedload flux: Estimates of bedload flux from suspended-sediment data from Curtiss (1975). Abbreviations: FPKM, flood-plain kilometer; (e), commercial extraction at mined sites occurred in the previous summer; rfv, surveyed raw fill volume at mined sites; –, data not available]

Site name	Reach name	FPKM	Moblity index	Water year	Deposition rates from surveys at mined sites (metric tons)	Calculated bed-material flux rates from equations of transport capacity 1951–2008 (metric tons)				Bed-material flux from sediment yield analysis (metric tons)	Bedload flux from suspended sediment measurements (metric tons)
Site name	Reach name	FPKM	Moblity index	Water year	Deposition rates from surveys at mined sites (metric tons)	Parker-Klingeman-McLean	Parker-Klingeman	Parker	Wilcock-Crowe
Scottsburg Bar	Downstream boundary of Coast Range reach	41.6	0.29	1951–2008	–	389,450	363,300	49,420	28,070	30,500	–
USGS  streamflow-  gaging station  at Elkton	Coast Range reach	84.7	–	1951–2008	–	3,650	3,510	2,270	9,510	34,600	95,200
Two Forks Bar	Garden Valley reach	168.4	1.486	1951–2008	–	250	340	230	14,130	44,400	–
Umpqua Sand and Gravel Bar	Roseburg reach	172	0.298	2001	550 (rfv)	0	0	0	0	43,200	–
				2002 (e)	3,220 (rfv)	3,010	3,390	580	2,150
				2003	4,290 (rfv)	13,700	13,190	2,870	4,940
				2004 (e)	1,790	18,010	17,170	4,870	5,370
				¹2005–2006 (e)	15,920	198,390	187,260	55,630	53,110
				2007	1,650	34,960	32,960	8,240	10,110
				2008	3,110	7,670	7,760	1,600	3,650
				1951–2008	2,290	2,280	9,070	27,200
Little Valley Bar	Roseburg reach	190.5	0.238	2003	7,600 (rfv)	3,590	3,640	14,190	20,550	45,500	–
				2004	3,600 (rfv)	550	670	5,830	13,510
				2005	2,610	870	980	5,720	9,120
				2006	9,200	24,450	23,110	61,270	68,460
				2007	3,110	5,190	4,940	16,320	22,740
				2008	1,680	1,660	1,710	9,250	16,980
				1951–2008	30,710	9,640	27,110	33,250
USGS streamflow- gaging station  at Brockway	Roseburg reach	195.3	–	1951–2008	–	47,730	44,030	16,120	25,410	46,200	46,260
Weigle Bar	Roseburg reach	211.75	0.068	2003	2,300 (rfv)	37,850	35,240	49,310	90,190	44,300	–
				2004	790 (rfv)	15,740	14,560	29,170	76,540
				2005 (e)	2,450	15,690	14,520	21,510	41,460
				2006	8,380	154,590	145,110	174,920	239,780
				2007	-1,870	42,330	39,560	54,890	96,950
				2008	170	24,730	22,950	38,590	84,130
				1951–2008	–	67,850	63,550	82,240	128,300
Gazley East Bar	Days Creek reach	232.4	0.345	2003	3,950 (rfv)	3,590	3,640	14,190	20,550	25,300	–
				2004	4,500	550	670	5,830	13,510
				2005	-9,240	870	980	5,720	9,120
				2006	20,810	24,450	23,110	61,270	68,460
				2007	-1,930	5,190	4,940	16,320	22,740
				2008	1,300	1,660	1,710	9,250	16,980
				1951–2008	–	5,080	6,050	540	2,350
Days Creek Bar	Days Creek reach	250.5	0.86	2003	3,230 (rfv)	0	380	130	90	23,300	–
				2004	5,940 (rfv)	80	580	280	220
				2005 (e)	80	1,180	1,510	680	560
				2006	9,210	2,670	4,330	2,180	1,740
				2007	-2,800	0	480	300	220
				2008	6,630	0	340	60	40
				1951–2008	–	2,870	2,940	1,360	1,060
USGS streamflow- gaging station  at Tiller	Upstream boundary of Days Creek reach	273	–	1951–2008	–	53,670	50,160	9,420	23,800	19,200	3,800
Tributary streams
Cow Creek at  Riddle Bridge  Bar	Lower Cow Creek	Enters South Umpqua River at FPKM 230.1	–	1951–2008	–	1,550	1,520	17,040	9,970	20,500	16,800
North Umpqua  near Winchester	Lower North Umpqua River	Joins South Umpqua River at FPKM 168.4	–	1956–1973	–	–	–	–	–	0	21,800
Lookingglass Creek near Brockway	Lower Lookingglass Creek	Joins South Umpqua River at FPKM 199.4	–	1956–1973	–	–	–	–	–	5,300	8,400
Calapooya Creek near Oakland	Lower  Calapooya Creek	Joins South Umpqua River at FPKM 156	–	1976–1973	–	–	–	–	–	800	5,170

¹ No survey available at Umpqua Sand and Gravel for 2005, so survey from 2006 accounts for water years 2005–2006.