Monthly Water Sampling Results for Roberts Creek @ Grape Rd

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 Total Suspended Solids mg/L Chloride (Lab) mg/L Sulfate mg/L
10/27/15 11:10 Brad Crawford 9.9 49.8 60+ 0.09 4.3 52 1.3 20.8 30.6
09/29/15 13:00 Brad Crawford 18.2 64.8 60+ 0.1 4.2 504 0.5 20.3 28.1
08/25/15 10:25 Brad Crawford 16.3 61.3 60+ 0.11 5.3 121 1.3 21.3 28.6
07/28/15 10:10 Brad Crawford 19.7 67.5 60+ 0.12 6.7 241 0.8 19.3 23.9
06/30/15 12:40 Ross Evelsizer 23.3 73.9 30 15.7 4611 37 22.1 22.9
11/05/14 10:35 Brad Crawford 8.46 <29 7.3 45.1 60+ 12 0.09 5.8 63
10/01/14 14:10 Brad Crawford 8.22 16.2 61.2 60+ 0.1 5.6 110
09/03/14 14:15 Brad Crawford 8.8 <29 23.4 74.1 60+ 12 0.12 5.3 290
08/06/14 13:55 Brad Crawford 8.5 <29 21.7 71.1 60+ 0.09 8.4 120
07/09/14 10:20 Brad Crawford 8.46 <29 17.6 63.7 38 10 0.12 14.0 1100
06/04/14 10:45 Brad Crawford 8.12 <29 18.8 65.8 60+ 8 0.12 7.2 230
05/07/14 09:55 Brad Crawford 8.66 <29 12.2 54.0 60+ 10 0.11 9.1 30
04/02/14 10:45 Brad Crawford 8.32 <29 5.8 42.4 17 10 0.28 5.2 31
11/06/13 10:26 Brad Crawford & Richard Kittelson 9.11 <30 8.2 46.8 60+ 10 0.22 <0.1 190 0.53
10/16/13 11:10 Brad Crawford 7.43 <30 11.1 52.0 60+ 9 0.08 6.0 41 <0.05
09/04/13 09:30 Brad Crawford and Dave Pahlas 8.18 <30 16.1 61.0 60+ 10 0.08 6.8 120 <0.05
08/07/13 09:55 Brad Crawford and Dave Pahlas 8.18 <30 20.0 68.0 46 10 0.14 7.7 1800 <0.05
07/10/13 14:45 Brad Crawford 8.16 23.2 73.8 20 0.21 12.0 1600 <0.05
06/05/13 11:20 Brad Crawford and Dave Pahlas 8.07 <30 12.5 54.5 35 10 0.15 15.0 1200 <0.05
05/01/13 10:15 Brad Crawford 8.54 <30 15.0 59.0 60+ 12 0.08 9.3 550 <0.05
04/10/13 11:51 Brad Crawford, Dave Pahlas 8.15 <30 5.5 41.9 5 10 1.2 7.3 17000 0.55
04/10/13 11:50 Brad Crawford, Dave Pahlas 8.15 <30 5.5 41.9 5 10 1.2 7.4 13000 0.52
11/07/12 13:00 8.6 <33 7.7 45.9 60+ 12 0.04 4.5 52 <0.05
10/03/12 14:30 8.58 <33 15.9 60.6 60+ 12 0.05 4.6 52 <0.05
09/05/12 13:20 8.05 <33 21.0 69.8 5 10 0.61 3.5 24000+ 0.05
08/01/12 15:15 <33 26.1 79.0 60+ 12 0.06 4.8 200 <0.05
07/02/12 08:55 7.98 <33 21.1 70.0 60+ 10 0.11 9.0 580 0.12
06/06/12 13:05 <33 20.6 69.0 60+ 12 0.1 13.0 120 <0.05
05/02/12 14:50 8.07 <33 17.8 64.0 7 18 0.45 8.5 9800 0.07
04/04/12 13:40 8.77 <33 16.4 61.5 60+ 12 0.06 6.8 31 <0.05
11/02/11 14:25 8.43 <33 9.8 49.6 60+ 12 0.05 5.2 52 <0.05
10/05/11 10:06 8.31 <33 12.4 54.3 60+ 12 0.07 5.7 75 <0.05
09/07/11 10:20 8.1 <33 13.9 57.0 60+ 10 0.21 7.3 840 <0.05
08/03/11 08:35 7.89 <33 20.7 69.3 60+ 8 0.08 8.8 840 <0.05
07/06/11 13:50 8.37 <33 24.4 75.9 60+ 10 0.1 11.0 230 <0.05
06/01/11 09:50 8.4 <33 17.8 64.0 25 9 0.18 12.0 480 <0.05
05/04/11 16:00 8.6 <33 13.9 57.0 60+ 10 0.36 11.0 10 <0.05
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Yearly Averages for Roberts Creek @ Grape Rd (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 Total Suspended Solids mg/L Chloride (Lab) mg/L Sulfate mg/L
All Years 8.3 (8.3) <33 (<33) 16.2 (15.6) 61.1 (60.1) 58 (53) 10.8 (8.6) 0.18 (0.19) 7.7 (6.5) 272 (376) 0.09 (0.09) 8 (20) 20.76 (22.17) 26.82 (23.58)
2015 Mean (8.3) (<33) 17.5 (17.3) 63.5 (63.1) 60+ (53) (7.2) 0.11 (0.23) 7.2 (6.1) 323 (442) 8 (20) 20.76 (22.17) 26.82 (23.58)
2014 Mean 8.4 (8.2) <33 (<33) 15.4 (14.6) 59.7 (58.3) 60+ (57) 10.3 (8.4) 0.13 (0.18) 7.6 (7.3) 124 (196)
2013 Mean 8.2 (8.2) <33 (<33) 14.0 (13.6) 57.1 (56.5) 49 (46) 10.1 (8.8) 0.27 (0.27) 8.0 (7.6) 624 (960) 0.16 (0.13)
2012 Mean 8.3 (8.3) <33 (<33) 18.3 (17.4) 65.0 (63.3) 56 (51) 12+ (8.8) 0.19 (0.17) 6.8 (4.8) 367 (374) 0.06 (0.07) (16)
2011 Mean 8.3 (8.3) <33 (<33) 16.1 (15.9) 61.0 (60.7) 60+ (58) 10.1 (9.0) 0.15 (0.1) 8.7 (6.4) 163 (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 22.2% 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 44.4% 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).

One-time Rainfall Event Samples for Roberts Creek @ Grape Rd (Not part of above statistics)

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 Total Suspended Solids mg/L Chloride (Lab) mg/L Sulfate mg/L
05/30/13 12:30 Brad Crawford & Ross Evelsizer 7.5 17.1 62.8 1 2.7 8.2 0.5
03/11/13 14:00 Gary Siegwarth 8.6 <33 0.9 33.6 9 0.82 0.92 3900 1.2

Site Information

NameRoberts Creek @ Grape Rd
CodeROB-10
CountyClayton
Latitude42.8395
Longitude-91.3745
UTM_X632841.0
UTM_Y4744275.0
HUC_87060004
Sampled byNortheast Iowa Resource Conservation and Development

Sampling Location

Photos from ROB-10

Nearby Sampling Locations