Monthly Water Sampling Results for Dry Mill 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 11:20 Brad Crawford 8.9 48.0 60+ 0.08 5.6 96 0.5 15.9 38.9
09/29/15 12:50 Brad Crawford 15.4 59.7 60+ 0.1 5.2 1274 2 16.1 36.8
08/25/15 10:15 Brad Crawford 14.1 57.4 60+ 0.1 7.7 496 2 17.0 33.3
07/28/15 10:05 Brad Crawford 18.6 65.5 60+ 0.13 10.2 637 1.1 17.7 26.7
06/30/15 12:47 Ross Evelsizer 17.9 64.2 60+ 18.0 620 8.7 20.2 22.2
11/05/14 10:25 Brad Crawford 8.14 <29 7.0 44.6 60+ 12 0.09 8.0 41
10/01/14 14:15 Brad Crawford 8.13 13.8 56.8 60+ 0.06 8.0 120
09/03/14 14:05 Brad Crawford 8.4 <29 20.1 68.2 60+ 0.16 8.5 300
08/06/14 13:40 Brad Crawford 8.38 <29 19.3 66.7 60+ 0.1 12.0 260
07/09/14 10:10 Brad Crawford 8.53 <29 15.8 60.4 60+ 10 0.07 15.0 510
06/04/14 10:35 Brad Crawford 8.06 <29 17.4 63.3 60+ 8 0.15 8.9 510
05/07/14 09:45 Brad Crawford 8.45 <29 11.6 52.9 60+ 10 0.05 9.6 41
05/07/14 09:40 Brad Crawford 8.45 <29 11.6 52.9 60+ 10 0.05 9.3 51
04/02/14 10:20 Brad Crawford 8.37 <29 4.8 40.6 60+ 11 0.17 6.6 <10
11/06/13 10:15 Brad Crawford & Richard Kittelson 9.08 <30 7.8 46.0 60+ 9 0.08 6.2 620 <0.05
10/16/13 10:58 Brad Crawford 7.41 <30 10.6 51.0 60+ 9 0.06 7.0 120 <0.05
10/16/13 10:55 Brad Crawford 7.45 <30 10.6 51.0 60+ 9 0.06 7.0 85 <0.05
09/04/13 09:15 Brad Crawford and Dave Pahlas 8.12 <30 14.2 57.6 60+ 8 0.05 9.0 52 <0.05
08/07/13 09:45 Brad Crawford and Dave Pahlas 8.18 <30 18.9 66.0 55 10 0.12 9.4 2800 <0.05
07/10/13 14:40 Brad Crawford 8.32 20.4 68.7 60+ 0.08 14.0 2200 <0.05
06/05/13 11:10 Brad Crawford and Dave Pahlas 8.07 <30 11.7 53.1 39 10 0.13 17.0 2100 <0.05
05/01/13 09:55 Brad Crawford 8.5 <30 13.9 57.0 60+ 12 0.05 12.0 160 <0.05
04/10/13 11:40 Brad Crawford, Dave Pahlas 8.16 <30 4.3 39.7 7 10 0.63 9.8 3300 0.35
11/07/12 12:45 8.68 <33 7.7 45.9 60+ 12 0.04 5.4 52 <0.05
10/03/12 14:20 8.54 <33 13.9 57.0 60+ 12 0.05 6.2 180 <0.05
09/05/12 13:03 7.81 <33 19.3 66.7 2 10 1.5 3.2 24000+ 0.11
08/01/12 15:00 <33 22.8 73.0 60+ 12 0.06 8.2 370 <0.05
08/01/12 15:00 <33 22.8 73.0 60+ 12 0.07 7.5 480 <0.05
07/02/12 09:05 8.07 <33 20.0 68.0 60+ 10 0.12 11.0 760 <0.05
06/06/12 12:55 <33 17.2 63.0 60+ 10 0.05 15.0 200 <0.05
05/02/12 15:00 7.96 <33 16.5 61.7 5 8 0.65 12.0 20000 0.22
04/04/12 13:30 8.55 <33 13.2 55.8 60+ 12 0.04 11.0 10 <0.05
11/02/11 14:00 8.3 <33 9.1 48.4 60+ 10 0.1 7.3 <0.05
11/02/11 14:00 8.3 <33 9.1 48.4 60+ 10 0.06 7.3 140 <0.05
10/05/11 10:15 8.15 <33 10.5 50.9 60+ 10 0.08 8.2 120 <0.05
09/07/11 10:00 8.13 <33 12.5 54.5 60+ 10 0.18 8.9 910 <0.05
08/03/11 08:48 8.0 <33 19.7 67.5 60+ 8 0.11 12.0 1300 0.11
07/06/11 13:45 8.42 <33 23.2 73.8 60+ 9 0.08 11.0 500 <0.05
06/01/11 10:10 8.3 <33 15.7 60.3 55 10 0.13 14.0 1000 <0.05
05/04/11 16:20 8.7 <33 12.9 55.2 60+ 11 0.03 14.0 10 <0.05
Download in CSV format

Yearly Averages for Dry Mill 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) 14.5 (15.6) 58.0 (60.1) 60+ (53) 10.1 (8.6) 0.16 (0.19) 9.8 (6.5) 334 (376) 0.07 (0.09) 3 (20) 17.38 (22.17) 31.58 (23.58)
2015 Mean (8.3) (<33) 15.0 (17.3) 59.0 (63.1) 60+ (53) (7.2) 0.1 (0.23) 9.3 (6.1) 474 (442) 3 (20) 17.38 (22.17) 31.58 (23.58)
2014 Mean 8.3 (8.2) <33 (<33) 13.7 (14.6) 56.7 (58.3) 60+ (57) 10.2 (8.4) 0.11 (0.18) 9.5 (7.3) 119 (196)
2013 Mean 8.2 (8.2) <33 (<33) 12.7 (13.6) 54.9 (56.5) 58 (46) 9.7 (8.8) 0.15 (0.27) 10.6 (7.6) 608 (960) 0.08 (0.13)
2012 Mean 8.3 (8.3) <33 (<33) 16.3 (17.4) 61.4 (63.3) 55 (51) 10.8 (8.8) 0.32 (0.17) 8.9 (4.8) 500 (374) 0.07 (0.07) (16)
2011 Mean 8.3 (8.3) <33 (<33) 14.8 (15.9) 58.7 (60.7) 60+ (58) 9.7 (9.0) 0.1 (0.1) 10.8 (6.4) 268 (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).

Download in CSV format

Water Quality Standards

For 41.7% 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 58.3% 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 Dry Mill 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 12:45 Brad Crawford & Ross Evelsizer 7.8 15.3 59.5 1.0 14.0 0.08

Site Information

NameDry Mill Creek @ Grape Rd
CodeDMI-10
CountyClayton
Latitude42.8433
Longitude-91.3697
UTM_X633222.0
UTM_Y4744705.0
HUC_87060004
Sampled byNortheast Iowa Resource Conservation and Development

Sampling Location

Photos from DMI-10

Nearby Sampling Locations

← Upstream

    Downstream →