Monthly Water Sampling Results for Roberts Creek @ 206th St/B65 (St. Olaf)

Sample Date by pH

Chloride mg/L Celsius C Fahrenheit F Transparency cm DO mg/L P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L
05/04/11 15:10 8.8 <33 12.8 55.0 55 12 0.16 10.0 31 <0.05
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Yearly Averages for Roberts Creek @ 206th St/B65 (St. Olaf) (with comparison to all sites in the watershed)

pH

Chloride mg/L Celsius C Fahrenheit F Transparency cm DO mg/L P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L
All Years 8.8 (8.3) <33 (<33) 12.8 (15.6) 55.0 (60.1) 55 (53) 12.0 (8.6) 0.16 (0.19) 10.0 (6.5) 31 (376) <0.05 (0.09)
2011 Mean 8.8 (8.3) <33 (<33) 12.8 (15.9) 55.0 (60.7) 55 (58) 12.0 (9.0) 0.16 (0.1) 10.0 (6.4) 31 (237) <0.05 (0.06)

How to Read the Table

GREEN: Better than average water quality compared to other sites in the watershed

BLACK: Average water quality compared to other sites in the watershed or N/A

RED: Worse than average water quality compared to other sites in the watershed

GRAY: The average value from all sites in the watershed. Useful for comparison.

*All averages are arithmetic means, except for E. Coli and/or Fecal Coliform, which are calculated as geometric means. For purposes of calculating a mean, values that exceed the measurement limit (e.g., <0.05, 60+, <33) are assumed to be 20% greater or less than their limit (e.g., 0.04, 72, 26.4).

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Water Quality Standards

For 0.0% of the data records, Nitrate+Nitrite exceeded 10 mg/L. 10 mg/L represents the U.S. Public Health Service recommended limit of 10 mg/L NO3-N (nitrate-nitrogen) in drinking water.

For 0.0% of the data records, E. coli bacteria exceeded 235 CFU/100 ml. 235 CFU/100 ml represents Iowa's single sample maximum water quality standard for primary contact recreational use (Class A1), secondary contact recreational use (Class A2), and children's recreational use (A3).

Site Information

NameRoberts Creek @ 206th St/B65 (St. Olaf)
CodeROB-30
CountyClayton
Latitude42.9304
Longitude-91.3855
UTM_X631744.0
UTM_Y4754352.0
NotesNo Longer Active - Sampled May 2011 Only
HUC_87060004
Sampled byNortheast Iowa Resource Conservation and Development

Sampling Location

Nearby Sampling Locations

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