Monthly Water Sampling Results for Roberts Creek @ Dalmation Ave

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 12:15 Brad Crawford 9.5 49.1 60+ 0.1 4.2 243 5 20.1 33.0
09/29/15 14:15 Brad Crawford 19.6 67.3 58 0.18 3.7 1515 7.2 18.2 28.2
08/25/15 11:40 Brad Crawford 17.7 63.9 60+ 0.16 5.2 250 8.8 20.9 30.0
07/28/15 09:15 Brad Crawford 22.9 73.2 60+ 0.14 6.1 539 2.5 18.8 25.5
06/30/15 10:47 Ross Evelsizer 17.8 64.0 41 0.14 13.7 1178 29.3 21.3 24.5
11/05/14 09:50 Brad Crawford 8.2 <29 6.2 43.2 59 12 0.07 6.9 98
11/05/14 09:45 Brad Crawford 8.19 <29 6.2 43.2 59 12 0.11 6.9 140
10/01/14 10:10 Brad Crawford 8.06 <29 13.5 56.3 51 6 0.12 5.5 330
09/03/14 10:15 Brad Crawford 8.2 <29 18.9 66.0 54 8 0.24 5.4 410
08/06/14 10:30 Brad Crawford 8.27 <29 19.7 67.5 46 8 0.11 8.0 580
07/09/14 11:30 Brad Crawford 8.3 <29 17.4 63.3 51 8 0.1 13.0 740
06/04/14 09:30 Brad Crawford 7.97 <29 19.1 66.4 60+ 8 0.14 7.3 310
06/04/14 09:25 Brad Crawford 7.97 <29 19.1 66.4 60+ 7 0.11 7.3 280
05/07/14 08:50 Brad Crawford 8.37 <29 11.1 52.0 60+ 10 0.09 9.5 75
04/02/14 09:15 Brad Crawford 8.45 <29 5.0 41.0 23 12 0.34 5.0 52
11/06/13 09:17 Brad Crawford & Richard Kittelson 8.4 <30 6.9 44.4 27 10 0.26 <0.1 840 0.58
10/16/13 10:10 Brad Crawford 7.65 <30 10.6 51.0 54 7 0.08 4.9 440 <0.05
09/04/13 10:50 Brad Crawford and Dave Pahlas 8.25 <30 19.0 66.2 37 8 0.14 6.5 310 <0.05
08/07/13 09:00 Brad Crawford and Dave Pahlas 8.04 <30 20.4 68.7 35 7 0.17 7.1 6500 <0.05
07/10/13 11:05 Brad Crawford 8.09 <30 19.7 67.5 19 10 0.2 11.0 4100 <0.05
06/05/13 09:10 Brad Crawford and Dave Pahlas 7.91 <30 11.4 52.5 33 8 0.15 14.0 560 0.06
05/01/13 12:50 Brad Crawford 8.57 <30 16.0 60.8 60+ 12 0.09 8.3 2200 <0.05
04/10/13 13:30 Brad Crawford, Dave Pahlas 8.09 <30 3.5 38.3 3 12 1.9 7.7 17000 0.56
11/07/12 11:49 8.72 <33 5.5 41.9 60+ 12 0.06 4.0 98 <0.05
10/03/12 10:15 8.38 <33 12.1 53.8 60+ 10 0.06 2.6 330 <0.05
09/05/12 14:50 8.02 <33 21.7 71.1 18 6 0.31 2.3 3100 0.1
08/01/12 12:45 <33 25.6 78.0 60+ 12 0.09 3.0 250 0.06
07/02/12 07:40 8.14 <33 25.6 78.0 44 6 0.13 5.6 360 0.07
06/06/12 14:22 <33 20.6 69.0 60+ 12 0.1 12.0 340 0.06
05/02/12 12:35 8.06 <33 15.9 60.6 32 10 0.15 7.2 660 <0.05
04/04/12 15:35 8.78 <33 17.1 62.8 60+ 12 0.03 5.7 10 <0.05
11/02/11 12:35 8.45 <33 8.8 47.8 60+ 10 0.1 4.8 370 <0.05
10/05/11 08:56 8.32 <33 12.6 54.7 45 8 0.12 5.2 400 <0.05
09/07/11 08:30 8.29 <33 15.2 59.4 28 8 0.19 5.7 540 <0.05
08/03/11 07:10 8.13 <33 24.6 76.3 60+ 6 0.12 7.2 620 0.08
07/06/11 12:10 8.42 <33 24.3 75.7 26 6 0.17 9.0 700 <0.05
06/01/11 08:30 8.1 15.4 59.7 29 0.11 12.0 200 <0.05
05/04/11 14:50 8.7 <33 12.2 54.0 60+ 10 0.09 9.9 <10 <0.05
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Yearly Averages for Roberts Creek @ Dalmation Ave (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) 15.6 (15.6) 60.2 (60.1) 51 (53) 9.1 (8.6) 0.19 (0.19) 6.9 (6.5) 424 (376) 0.09 (0.09) 11 (20) 19.86 (22.17) 28.24 (23.58)
2015 Mean (8.3) (<33) 17.5 (17.3) 63.5 (63.1) 60+ (53) (7.2) 0.14 (0.23) 6.6 (6.1) 567 (442) 11 (20) 19.86 (22.17) 28.24 (23.58)
2014 Mean 8.2 (8.2) <33 (<33) 13.9 (14.6) 57.0 (58.3) 54 (57) 8.9 (8.4) 0.15 (0.18) 7.6 (7.3) 234 (196)
2013 Mean 8.1 (8.2) <33 (<33) 13.4 (13.6) 56.2 (56.5) 35 (46) 9.3 (8.8) 0.37 (0.27) 7.4 (7.6) 1682 (960) 0.18 (0.13)
2012 Mean 8.4 (8.3) <33 (<33) 18.0 (17.4) 64.4 (63.3) 57 (51) 10.0 (8.8) 0.12 (0.17) 5.3 (4.8) 259 (374) 0.06 (0.07) (16)
2011 Mean 8.3 (8.3) <33 (<33) 16.2 (15.9) 61.1 (60.7) 49 (58) 8.0 (9.0) 0.13 (0.1) 7.7 (6.4) 247 (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 16.7% 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 80.6% 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 @ Dalmation Ave
CodeROB-50
CountyClayton
Latitude42.9596
Longitude-91.4563
UTM_X625909.0
UTM_Y4757483.0
NotesLow-water bridge
HUC_87060004
Sampled byNortheast Iowa Resource Conservation and Development

Sampling Location

Photos from ROB-50

Nearby Sampling Locations

← Upstream