USGS Scientific Investigations Report 2012–5017  - Geomorphic Setting, Aquatic Habitat, and Water-Quality Conditions of the Molalla River, Oregon, 2009

Table 8. Diel field parameter data and diel ranges in the main-stem Molalla River, Oregon, August–September 2010. 

[Shading indicates diel ranges. Abbreviations: ft³/s, cubic foot per second; ºC, degrees Celsius; µS/cm, microsiemens per centimeter; mg/L, milligram per liter; µg/L, microgram per liter; <, less than; –, no data] 

Site	River  kilometer	Date	Time	Streamflow (ft³/s)	Water temperature (ºC)	Specific conductance (µS/cm)	Dissolved oxygen (mg/L)	Dissolved oxygen in percent saturation	pH, in standard units	Turbidity, in formazin nephelometric units	Chlorophyll-a (µg/L)
Molalla River upstream of Glen Avon Bridge	42.8	Aug. 2, 2010	1600	–	19.5	52	9.4	103.3	8.0	0.7	0.7
Molalla River upstream of Highway 211 Bridge	30.1	Aug. 2, 2010	1620	–	22.2	54	9.1	106.1	7.9	0.5	1.0
Molalla River upstream of Highway 213 Bridge	23.5	Aug. 2, 2010	1640	–	22.2	58	9.4	109.1	7.6	0.9	0.8
Molalla River upstream of Goods Bridge	9.7	Aug. 2, 2010	1710	126	23.5	66	9.4	112.4	7.9	0.7	0.9
Molalla River downstream of Knights Bridge	4.3	Aug. 2, 2010	1740	–	24.1	73	9.8	118.9	8.3	0.7	1.3
Molalla River upstream of Glen Avon Bridge	42.8	Aug. 3, 2010	0540	–	16.4	53	9.3	96.5	7.7	1.3	0.7
Molalla River upstream of Highway 211 Bridge	30.1	Aug. 3, 2010	0610	–	17.3	54	8.8	92.8	7.5	1.0	0.9
Molalla River upstream of Highway 213 Bridge	23.5	Aug. 3, 2010	0630	–	18.9	59	8.1	88.3	7.4	1.0	1.2
Molalla River upstream of Goods Bridge	9.7	Aug. 3, 2010	0650	124	19.8	67	7.6	84.3	7.3	1.0	1.7
Molalla River downstream of Knights Bridge	4.3	Aug. 3, 2010	0720	–	20.0	77	7.9	87.5	7.4	1.4	1.0
Molalla River upstream of Glen Avon Bridge	42.8	Aug. 2–3, 2010	Diel range	–	3.1	1.0	0.0	6.8	0.3	–	–
Molalla River upstream of Highway 211 Bridge	30.1	Aug. 2–3, 2010	Diel range	–	4.9	0.0	.3	13.3	0.3	–	–
Molalla River upstream of Highway 213 Bridge	23.5	Aug. 2–3, 2010	Diel range	–	3.3	1.0	1.3	20.8	0.2	–	–
Molalla River upstream of Goods Bridge	9.7	Aug. 2–3, 2010	Diel range	–	3.7	1.0	1.8	28.1	0.6	–	–
Molalla River downstream of Knights Bridge	4.3	Aug. 2–3, 2010	Diel range	–	4.1	4.0	2.0	31.4	0.9	–	–
Molalla River upstream of Glen Avon Bridge	42.8	Sept. 14, 2010	1400	–	15.0	54	10.5	106.1	8.0	<0.5	1.1
Molalla River upstream of Highway 211 Bridge	30.1	Sept. 14, 2010	1430	–	17.3	55	10.1	106.6	7.8	<0.5	0.8
Molalla River upstream of Highway 213 Bridge	23.5	Sept. 14, 2010	1520	–	18.7	61	10.3	112.2	7.6	<0.5	0.1
Molalla River upstream of Goods Bridge	9.7	Sept. 14, 2010	1550	89	19.5	68	10.4	114.2	7.8	< 0.5	2.1
Molalla River downstream of Knights Bridge	4.3	Sept. 14, 2010	1650	–	19.8	77	11.1	122.0	8.4	< 0.5	0.8
Molalla River upstream of Glen Avon Bridge	42.8	Sept. 15, 2010	0650	–	14.4	56	9.8	97.8	7.5	< 0.5	0.9
Molalla River upstream of Highway 211 Bridge	30.1	Sept. 15, 2010	0720	–	15.7	57	9.1	92.7	7.4	0.5	1.0
Molalla River upstream of Highway 213 Bridge	23.5	Sept. 15, 2010	0740	–	16.3	62	8.7	89.7	7.2	< 0.5	0.7
Molalla River upstream of Goods Bridge	9.7	Sept. 15, 2010	0810	89	16.9	70	8.4	87.2	7.2	< 0.5	0.8
Molalla River downstream of Knights Bridge	4.3	Sept. 15, 2010	0830	–	17.2	96	8.6	89.8	7.4	0.5	1.1
Molalla River upstream of Glen Avon Bridge	42.8	Sept. 14–15, 2010	Diel range	–	0.6	2.0	0.8	8.3	0.5	–	–
Molalla River upstream of Highway 211 Bridge	30.1	Sept. 14–15, 2010	Diel range	–	1.6	2.0	1.0	13.9	0.4	–	–
Molalla River upstream of Highway 213 Bridge	23.5	Sept. 14–15, 2010	Diel range	–	2.4	1.0	1.7	22.5	0.4	–	–
Molalla River upstream of Goods Bridge	9.7	Sept. 14–15, 2010	Diel range	–	2.6	2.0	2.0	27.0	0.6	–	–
Molalla River downstream of Knights Bridge	4.3	Sept. 14–15, 2010	Diel range	–	2.6	19.0	2.5	32.2	1.0	–	–

Geomorphic Setting, Aquatic Habitat, and Water-Quality Conditions of the Molalla River, Oregon, 2009–10

Geomorphic Setting, Aquatic Habitat, and Water-Quality Conditions of the Molalla River, Oregon, 2009–10 