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

Table 9. Nutrient concentration data for the main-stem Molalla River, Oregon, 2010. 

[Nutrient concentrations in milligrams per liter. Concentrations greater than the laboratory detection limits are shown in bold. Nutrient data from June 2000 (U.S. Geological Survey, unpub. data) are provided for comparison. Abbreviations: DIN, dissolved inorganic nitrogen [nitrite+nitrate+ammonia]; SRP, soluble reactive phosphorus; TP, total phosphorus; MDL, method detection limit; –, no data>] 

Site	River kilometer	Date	Dissolved ammonium	Dissolved nitrite plus nitrate	Dissolved inorganic nitrogen	Dissolved organic nitrogen	Total Kjeldahl nitrogen	Total dissolved phosphorus	Soluble reactive phosphorus	Total phosphorus	DIN:SRP	SRP:TP
Molalla River upstream of Scorpion Creek	71.0	June 26, 2000	0.028	0.018	0.046	–	–	–	0.005	0.007	9.2	0.7
Molalla River downstream of Pine Creek	51.7	June 26, 2000	0.002	0.012	0.014	–	–	–	0.003	0.007	4.7	0.4
Molalla River at Highway 211	30.1	June 26, 2000	0.021	0.020	0.041	–	–	–	0.003	0.006	13.7	0.5
Molalla River upstream of Milk Creek	15.8	June 26, 2000	0.007	0.021	0.028	–	–	–	0.002	0.007	14.0	0.3
Molalla River at Goods Bridge	9.7	June 26, 2000	–	–	–	–	–	–	–	–	–	–
Molalla River downstream of Knights Bridge	4.3	June 26, 2000	0.005	0.126	0.131	–	–	–	0.002	0.012	65.5	0.2
Molalla River at Glen Avon Bridge	42.8	Aug. 3, 2010	0.006	0.032	0.038	0.097	0.12	0.005	0.009	0.008	4.4	1.1
Molalla River at Highway 211	30.1	Aug. 3, 2010	0.002	0.023	0.025	0.102	0.12	0.004	0.007	0.007	3.6	1.1
Molalla River at Highway 213	23.5	Aug. 3, 2010	0.005	0.023	0.028	0.087	0.12	0.003	0.010	0.009	2.7	1.1
Molalla River at Goods Bridge	9.7	Aug. 3, 2010	0.002	0.071	0.073	0.118	0.19	0.006	0.009	0.011	8.5	0.8
Molalla River downstream of Knights Bridge	4.3	Aug. 3, 2010	0.003	0.327	0.330	0.139	0.15	0.007	0.010	0.013	32.4	0.8
Molalla River at Glen Avon Bridge	42.8	Sept. 15, 2010	0.005	0.022	0.026	0.028	0.15	0.004	0.009	0.007	2.8	1.4
Molalla River at Highway 211	30.1	Sept. 15, 2010	0.004	0.014	0.018	0.005	0.16	0.003	0.009	0.007	1.9	1.4
Molalla River at Highway 213	23.5	Sept. 15, 2010	0.001	0.034	0.035	0.04	0.16	0.003	0.009	0.007	3.8	1.4
Molalla River at Goods Bridge	9.7	Sept. 15, 2010	0.005	0.078	0.083	0.044	0.19	0.006	0.011	0.010	7.3	1.1
Molalla River downstream of Knights Bridge	4.3	Sept. 15, 2010	0.008	0.224	0.232	0.06	0.23	0.008	0.013	0.015	17.7	0.9
Laboratory MDLs			0.02	0.016	–	0.1	0.1	0.006	0.008	0.008	–	–

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 