Monthly Water Sampling Results for Hewett Creek @ Crystal Road Download in CSV format

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 13:15 Eric Palas 8.5 9.8 49.6 45 9 0.08 3.6 1145 13.5 10.8 16.2
09/29/15 13:10 Eric Palas 8.4 18.5 65.3 30 7 0.11 3.5 3255 27 9.8 14.3
08/25/15 12:55 Eric Palas 8.7 17.1 62.8 48 7 0.1 3.9 185 13 10.7 15.5
07/28/15 14:30 Eric Palas 8.3 <29 21.9 71.4 25 7 0.12 4.1 1421 4.8 9.5 14.2
06/30/15 13:00 Eric Palas 8.3 <29 15.8 60.4 5 9 0.65 5.2 30760 315 7.8 8.3
11/05/14 14:25 Eric Palas 8.5 <29 7.0 44.6 60+ 12 0.11 4.7 220
10/01/14 13:30 Pat Schaefers 8.23 <29 14.3 57.7 60+ 0.06 4.5 130
09/03/14 12:50 Eric Palas 8.2 <29 18.2 64.8 38 7 0.15 4.0 1600
08/06/14 13:10 Eric Palas 8.2 <29 18.7 65.7 42 7 0.08 5.0 470
07/09/14 12:05 Eric Palas 8.2 <29 19.8 67.6 55 9 0.07 6.9 1300
06/04/14 12:50 Eric Palas 8.1 <29 19.1 66.4 60+ 7 0.11 4.4 1800
05/07/14 12:55 Eric Palas 8.3 <29 12.2 54.0 60+ 10 0.15 4.9 690
04/02/14 13:44 Eric Palas 8.8 <29 4.5 40.1 20 11 0.19 4.1 220
11/06/13 14:00 Eric Palas 8.3 <30 7.8 46.0 33 10 0.1 4.3 16000 <0.05
10/16/13 13:30 Eric Palas 8.3 <30 11.3 52.3 55 9 0.06 4.7 120 <0.05
09/04/13 12:50 Eric Palas 8.2 <30 16.2 61.2 60+ 9 0.07 4.7 180 <0.05
08/07/13 13:00 Eric Palas 8.3 <30 20.4 68.7 45 8 0.07 4.8 5800 <0.05
07/10/13 13:50 Pat Schaefers 8.34 <30 21.0 69.8 33 10 0.09 5.5 2900 <0.05
06/05/13 13:06 Eric Palas 8.2 <30 11.8 53.2 42 9 0.11 6.8 1500 <0.05
05/01/13 12:20 Eric Palas 8.5 <30 13.0 55.4 47 9 0.06 5.0 860 <0.05
04/10/13 12:40 Eric Palas 8.6 <30 3.8 38.8 3 12 0.78 3.1 4900 0.11
11/07/12 14:00 8.7 <33 5.5 41.9 60+ 11 0.04 3.8 250 <0.05
10/03/12 12:45 8.6 <33 12.6 54.7 45 10 0.05 1.9 160 <0.05
09/05/12 13:20 8.6 <33 21.3 70.3 40 7 0.08 3.2 680 0.08
08/01/12 12:15 8.4 <33 21.6 70.9 35 6 0.09 2.8 690 0.05
07/02/12 12:40 8.1 <33 24.2 75.6 40 6 0.29 3.5 700 0.11
06/06/12 12:40 8.5 <33 16.9 62.4 51 11 0.07 4.8 540 <0.05
05/02/12 13:45 8.4 <33 14.6 58.3 3 11 0.72 3.4 24000+ 0.07
04/04/12 12:45 8.6 <33 10.9 51.6 40 8 0.04 4.8 200 <0.05
11/02/11 12:40 8.6 <33 10.3 50.5 60+ 10 0.07 5.0 74 <0.05
10/05/11 12:40 8.5 <33 11.6 52.9 60 10 0.06 5.0 410 <0.05
09/07/11 13:00 8.4 <33 12.8 55.0 30 10 0.09 5.5 1400 <0.05
08/03/11 12:25 8.4 <33 21.2 70.2 30 8 0.11 6.0 1500 0.11
07/06/11 12:40 8.5 <33 19.8 67.6 55 12 0.04 4.7 620 <0.05
06/01/11 13:00 8.5 <33 15.1 59.2 41 12 0.06 5.1 1000 <0.05
05/04/11 13:00 8.1 <33 5.5 41.9 40 12 0.05 5.2 250 <0.05
  • 10/27/2015: Beaver dam 250 ft upstream
  • 07/28/2015: sampled after rain
  • 06/30/2015: 1.0 inch rain on 6/29 at Strawberry Point
  • 04/10/2013: Turbid
  • 09/05/2012: 1.2" local rainfall

Yearly Averages for Hewett Creek @ Crystal Road (with comparison to all sites in the watershed) Download in CSV format

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 8.4 (8.3) <33 (<33) 14.6 (15.6) 58.3 (60.1) 44 (53) 9.2 (8.6) 0.14 (0.19) 4.5 (6.5) 854 (368) 0.05 (0.09) 75 (19) 9.72 (22.01) 13.7 (22.15)
2015 Mean 8.4 (8.3) <33 (<33) 16.6 (17.3) 61.9 (63.1) 31 (53) 7.8 (7.2) 0.21 (0.23) 4.1 (6.1) 1976 (442) 75 (20) 9.72 (22.17) 13.7 (23.58)
2014 Mean 8.3 (8.2) <33 (<33) 14.2 (14.6) 57.6 (58.3) 55 (57) 9.0 (8.4) 0.12 (0.18) 4.8 (7.3) 544 (196)
2013 Mean 8.3 (8.2) <33 (<33) 13.2 (13.6) 55.7 (56.5) 41 (46) 9.5 (8.8) 0.17 (0.27) 4.9 (7.6) 1569 (960) <0.05 (0.13)
2012 Mean 8.5 (8.3) <33 (<33) 16.0 (17.4) 60.7 (63.3) 41 (51) 8.8 (8.8) 0.17 (0.17) 3.5 (4.8) 671 (374) 0.06 (0.07) (16)
2011 Mean 8.4 (8.3) <33 (<33) 13.8 (15.9) 56.8 (60.7) 47 (58) 10.6 (9.0) 0.07 (0.1) 5.2 (6.4) 517 (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).

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 75.0% 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).

One-time Rainfall Event Samples for Hewett Creek @ Crystal Road (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
03/11/13 18:32 Eric Palas/Pat Schaefers <33 2.0 35.6 11 0.45 1.1 2200 0.5

Site Information

NameHewett Creek @ Crystal Road
CodeHEW-20
CountyClayton
Latitude42.7859
Longitude-91.5185
UTM_X621177.0
UTM_Y4738099.0
HUC_87060004
Sampled byClayton County Soil and Water Conservation District

Sampling Location

Nearby Sampling Locations

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