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

Table 6. Stream discharge for the aerial photography used in the sediment transport study of the Umpqua River basin, Oregon.

[Main discharge: based on the streamflow when a majority of reach was photographed. The 1939 photograph discharge for the Days Creek, Roseburg, and North Umpqua reaches was estimated by dividing the 1967 discharge by 2.63; a ratio determined from the Garden Valley Reach. Ratio of main discharge: Mean annual discharge computed for 1955–2004, corresponding to period where all gages have complete annual flow records. Abbreviations: m³/s, cubic meters per second; –, discharge data not acquired because photos from this date for this reach were not used in study; e, estimated value]

Year	Reach	Flight dates	USGS streamflow-gaging station used to determine discharge at time of photograph	Discharge (m³/s)			Ratio of main discharge to mean annual discharge (m³/s)	Comments
Year	Reach	Flight dates		Minimum	Maximum	Main	Ratio of main discharge to mean annual discharge (m³/s)	Comments
1939	Tidal	05-05-39, 05-17-39, 05-25-39,07-20-39	Elkton (1432100)	32	102	32	0.15
	Coast Range	05-17-39, 05-30-39	Elkton (1432100)	69	88	80	0.38
	Garden Valley	05-30-39	Elkton (1432100)	69	69	69	0.33
	Roseburg	05-30-39	Elkton (1432100)	–	–	25 (e)	2.38	Brockway gage not operational
	Days Creek	05-30-39	Elkton (1432100)	–	–	18 (e)	0.89	Tiller gage not operational
	North Umpqua	05-27-39, 05-30-39	Elkton (1432100)	–	–	44 (e)	0.65	Winchester gage not operational
1967	Tidal	05-19-67	Elkton (1432100)	228	228	228	1.09
	Coast Range	05-7-57, 05-19-67, 08-03-67	Elkton (1432100)	31	228	228	1.09
	Garden Valley	05-07-67, 09-09-67	Elkton (1432100)	26	180	180	0.86
	Roseburg	05-07-67	Brockway (14312000)	65	65	65	1.00
	Days Creek	05-07-67, 05-19-67	Tiller (14308000)	38	48	48	0.78	Most of reach flown on 05-07-67
	North Umpqua	05-07-67	Winchester (14319500)	115	115	115	1.09
1994–1995	Tidal	–	Elkton (1432100)	–	–	–	–
	Coast Range	–	Elkton (1432100)	–	–	–	–
	Garden Valley	07-18-94, 06-19-94	Elkton (1432100)	30	48	30–48	0.19
	Roseburg	07-18-94, 06-19-94, 06-09-94, 05-07-94	Brockway (14312000)	2	26	10–26	0.22
	Days Creek	05-24-94, 06-09-94, 05-07-94, 06-28-94	Tiller (14308000)	4	12	4–12	0.28
	North Umpqua	–	Winchester (14319500)	–	–	–	–
2000	Tidal	–	Elkton (1432100)	–	–	–	–
	Coast Range	–	Elkton (1432100)	–	–	–	–
	Garden Valley	08-08-00	Elkton (1432100)	34	34	34	0.16
	Roseburg	07-30-00, 08-08-00, 08-14-00, 07-13-01	Brockway (14312000)	5	6	5–6	0.06
	Days Creek	07-24-00, 08-14-00	Tiller (14308000)	2	3	2–3	0.09
	North Umpqua	–	Winchester (14319500)	–	–	–	–
2005	Tidal	07-17-05, 07-19-05	Elkton (1432100)	38	39	39	0.19
	Coast Range	07-18-05, 07-19-05	Elkton (1432100)	38	39	39	0.18
	Garden Valley	07-18-05	Elkton (1432100)	39	39	39	0.18
	Roseburg	07-18-05, 08-04-05	Brockway (14312000)	4	7	7	0.09	Most of reach flown on 07-18-05
	Days Creek	07-18-05, 07-19-05, 08-04-05	Tiller (14308000)	2	4	4	0.14
	North Umpqua	07-18-05, 08-04-05	Winchester (14319500)	25	31	31	0.29
2009	Tidal	–	Elkton (1432100)	–	–	–	–
	Coast Range	–	Elkton (1432100)	–	–	–	–
	Garden Valley	06-22-09	Elkton (1432100)	62	62	62	0.19
	Roseburg	06-22-09	Brockway (14312000)	10	10	10	0.22
	Days Creek	06-22-09	Tiller (14308000)	6	6	6	0.28
	North Umpqua	–	Winchester (14319500)	–	–	–	–