Monthly Water Sampling Results for Decorah Dry Run Download in CSV format

Sample Date by pH

Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine - Screen ppb Membrane Fecal Coliform /100mL Chloride (Lab) mg/L Sulfate mg/L Total Suspended Solids mg/L
05/09/17 11:10 Dennis Myhre 8.46 13.3 55.9 60+
04/11/17 08:11 Jeremy Carolan 8.4 5.2 41.4 60+
10/11/16 09:05 Dennis Myhre 8.3 13.5 56.3 60+ 0.57 8.6 1354 19.8 17.9 5
09/13/16 09:00 Dennis Myhre 8.1 14.0 57.2 38 0.49 2.7 1968 68.0 19.3 18.5
08/09/16 08:55 Dennis Myhre 8.5 17.4 63.3 60+ 0.35 3.2 932 84.1 21.7 8.8
07/12/16 13:45 Dennis Myhre 8.34 23.4 74.1 60+ 0.16 1.9 2046 57.0 17.3 14.3
06/14/16 09:10 Dennis Myhre 8.43 18.5 65.3 60+ 0.32 2.9 820 88.7 22.1 21.5
05/10/16 09:00 Dennis Myhre 8.3 12.9 55.2 60+ 0.27 1.7 45.9 12.5 15.5
04/12/16 14:20 8.77 13.0 55.4 60+ 0.22 2.5 <4 88.3 21.6 6
10/06/15 08:50 Dennis Myhre 8.5 11.6 52.9 60+ 0.07 1.6 905 65.9 23.9 2.5
09/01/15 11:00 Dennis Myhre 8.5 20.9 69.6 60+ 0.1 2.3 1274 78.7 23.2 12.5
08/04/15 08:50 Dennis Myhre 8.47 16.8 62.2 60+ 0.09 2.5 1616 75.5 19.3 6.3
07/07/15 09:05 Dennis Myhre 8.46 16.3 61.3 60+ 0.12 2.7 1989 84.9 17.9 2
06/02/15 08:50 Dennis Myhre 8.6 13.4 56.1 60+ 0.05 2.7 250
05/05/15 11:00 Dennis Myhre 8.4 13.2 55.8 12 0.24 1.9 4900
04/07/15 00:00
10/07/14 08:50 Dennis Myhre 8.52 10.6 51.1 60+ 0.17 2.1 820
09/02/14 11:10 Dennis Myhre 8.39 18.4 65.1 60+ 0.11 2.3 2000
08/05/14 13:35 Dennis Myhre 8.5 19.6 67.3 60+ 0.11 2.4 3100
07/08/14 11:20 Jeremy Carolan 8.38 19.2 66.6 53.2 0.15 2.6 5200
06/03/14 09:07 Jon Young 8.41 17.3 63.1 60+ 0.06 2.1 1200
05/06/14 00:00 Dennis Myhre 8.66 12.6 54.7 60+ 0.03 2.2 96
04/01/14 00:00 Dennis Myhre 8.4 2.2 36.0 52 0.2 2.2 52
10/01/13 00:00 Dennis Myhre 8.5 16.4 61.5 60+ 0.07 2.1 1300 <0.05
09/03/13 00:00 Dennis Myhre 8.55 16.1 61.0 60+ 0.05 2.6 2100 <0.05
08/06/13 00:00 Dennis Myhre 8.35 17.0 62.6 60 0.1 2.5 3400 <0.05
07/09/13 00:00 Josh Dansdill 7.86 23.1 73.6 5 0.24 1.7 9200 0.06
06/04/13 00:00 Dennis Myhre 8.4 11.8 53.2 60+ 0.1 2.8 1100 <0.05
05/07/13 00:00 Dennis Myhre 8.55 14.3 57.7 60 0.06 2.2 63 <0.05
04/09/13 00:00 Dennis Myhre 8.23 7.4 45.3 0 0.57 0.53 2900 0.08
10/02/12 16:00 Dennis Myhre 8.4 13.4 56.1 60+ 0.04 0.57 2800 <0.05
09/04/12 13:45 Dennis Myhre 7.8 20.3 68.5 47 0.43 0.28 96000 0.3
08/07/12 13:10 Dennis Myhre 8.4 19.9 67.8 60+ 0.05 0.86 1800 <0.05
07/02/12 16:25 Paul Berland 8.2 28.3 82.9 60+ 0.08 1.0 8200 <0.05
07/02/12 16:20 Paul Berland 8.2 28.3 82.9 60+ 0.1 1.0 8200 <0.05
06/05/12 14:00 Dennis Myhre 8.3 18.1 64.6 60+ 0.06 1.3 1100 <0.05
05/01/12 16:10 Dennis Myhre 8.6 14.3 57.7 60+ 0.04 1.4 240 <0.05
04/03/12 13:15 Jeremy Carolan 8.3 10.7 51.3 60+ 0.05 0.76 1300 <0.05
10/04/11 13:55 0.07 1.6 820 <0.05
09/06/11 16:05 Dennis Myhre 8.2 14.5 58.1 60+ 0.09 3.2 580 <0.05
08/02/11 14:00 Dennis Myhre 8.2 20.7 69.3 60+ 0.07 2.8 1100 <0.05
07/05/11 16:40 Dennis Myhre 8.2 20.2 68.4 60+ 0.09 2.7 1700 <0.05
06/07/11 13:45 Dennis Myhre 8.2 18.0 64.4 60+ 0.07 2.6 800 <0.05
05/03/11 12:45 Dennis Myhre 8.2 7.4 45.3 60+ 0.05 2.9 10 <0.05
10/05/10 16:05 Dennis Myhre 8.25 10.4 50.7 60+ 0.06 2.7 390 <0.05
09/07/10 15:30 Dennis Myhre 8.2 14.6 58.3 60+ 0.15 3.0 2200 <0.05
08/03/10 16:30 Dennis Myhre 8.1 18.7 65.7 60+ 0.1 3.0 3400 <0.05
07/06/10 16:25 Dennis Myhre 8.0 20.8 69.4 60+ 0.11 2.5 1400 <0.05
06/01/10 15:45 Dennis Myhre 8.1 18.7 65.7 60+ 0.11 3.2 2500 <0.05
05/04/10 20:30 Dennis Myhre 8.2 19.3 66.7 60+ 0.49 2.5 20000 0.23
04/06/10 16:17 Jeremy Carolan 7.94 10.7 51.3 20 0.14 0.83 200 0.14
10/06/09 19:20 7.8 12.1 53.8 29 0.17 0.77 1200 0.06
09/01/09 16:05 0.06 2.0 200 <0.05
08/04/09 13:45 8.0 17.9 64.2 60+ 0.06 1.8 910 <0.05
07/07/09 14:10 8.1 17.9 64.2 60+ 0.06 1.9 2600 <0.05
06/02/09 14:15 8.3 14.3 57.7 60+ 0.06 2.3 520 <0.05
05/05/09 16:00 13.3 55.9 8 0.43 0.55 1900 0.27
04/07/09 16:15 8.6 7.2 45.0 60+ 0.03 1.7 50 <0.05
10/07/08 14:00 0.27 1.8 29000 0.14
09/02/08 16:15 8.2 22.0 71.6 60+ 0.09 3.2 1500 <0.05
08/05/08 19:20 8.2 23.0 73.4 60+ 0.12 3.1 1600 <0.05
07/01/08 14:05 8.17 15.0 59.0 60+ 0.08 3.2 2600 <0.05
06/03/08 14:05 7.8 15.2 59.4 11 0.38 1.4 55000 0.1
05/06/08 16:05 Dennis Myhre 8.1 14.4 57.9 60+ 0.09 3.2 310 <0.05
04/01/08 15:45 Dennis Myhre 8.1 7.0 44.6 60 0.11 3.3 20 <0.05
10/16/07 14:00 8.2 14.5 58.1 60+ 0.1 3.0 930 0.1
09/04/07 13:56 8.2 15.5 59.9 60+ 0.1 3.3 570 <0.05
08/07/07 16:05 7.9 22.7 72.9 15 0.22 0.67 16000 0.05
07/02/07 13:50 8.2 17.0 62.6 60+ 0.07 3.1 2400 <0.05
06/05/07 14:00 8.3 15.2 59.4 60+ 0.08 2.8 780 <0.05
05/01/07 16:05 8.4 17.0 62.6 55 0.06 2.2 70 <0.05
04/03/07 14:20 8.0 9.8 49.6 6 0.32 2.0 530 <0.05
10/03/06 13:45 8.1 16.1 61.0 60+ 0.08 1.2 1400 <0.05
09/05/06 13:50 8.15 16.1 61.0 52 0.12 2.4 1800 <0.05
08/01/06 13:55 8.0 23.9 75.0 28 0.18 1.6 15000 <0.05
07/05/06 13:50 8.3 17.0 62.6 60+ 0.11 3.0 3500 <0.05
06/06/06 16:05 7.9 20.0 68.0 12 0.23 1.0 58000 0.15
05/02/06 14:00 8.23 12.0 53.6 35 0.09 2.7 370 <0.05
04/04/06 14:15 8.4 6.6 43.9 60+ 0.06 2.3 30 0.09
10/04/05 14:05 8.7 20.4 68.7 60+ 0.09 2.0 750 <0.05 0.98
09/06/05 16:26 7.2 20.7 69.3 52 0.21 2.7 5200 0.05
08/02/05 14:00 8.37 26.0 78.8 56 0.14 2.5 8100 0.11 1.23
07/05/05 14:05 8.6 19.0 66.2 60+ 0.17 3.2 2300 0.05
06/07/05 13:55 9.0 6.1 43.0 60+ 0.11 2.0 2300 0.05 1.14
05/03/05 14:10 9.1 16.1 61.0 60+ 0.03 2.1 140 <0.05 0.44
04/06/05 16:10 9.1 16.1 61.0 60+ 0.06 1.7 150 <0.05
10/26/04 13:45 0.13 1.7 370 <0.05
09/30/04 19:00 45
09/28/04 13:45 0.07 1.5 0.06
08/31/04 14:00 0.07 1.9 7200 0.08
07/27/04 13:45 0.06 2.4 240 <0.05
06/29/04 13:55 0.12 2.0 500 <0.05
04/27/04 14:05 0.07 0.41 20 <0.05 0.15
05/02/02 14:15 0.06 2.1 <0.05 0.1 530.0
01/30/02 14:55 <0.05 1.2 <0.05 0.22 210.0
10/11/00 15:40 0.3 2.3 <0.1 0.24 1600.0
  • 05/09/2017: overcast, temps mid 50s. T-storms overnight over UIR, dropping variable amounts of rain (0.10 - 1.33 inches in Dorchester)
  • 06/02/2015: Cloudy
  • 05/05/2015: Rain
  • 04/07/2015: Sample Lost
  • 07/09/2013: Culvert backedup

Yearly Averages for Decorah Dry Run (with comparison to all sites in the watershed) Download in CSV format

pH

Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine - Screen ppb Membrane Fecal Coliform /100mL Chloride (Lab) mg/L Sulfate mg/L Total Suspended Solids mg/L
All Years 8.3 (8.2) 15.7 (15.0) 60.3 (59.0) 60+ (60) 0.14 (0.15) 2.2 (5.7) 1020 (299) 0.06 (0.07) 0.95 (18.32) 0.18 (0.14) 563 (74) 68.8 (15.85) 19.7 (14.37) 10 (11)
2017 Mean 8.4 (8.2) 9.3 (10.0) 48.7 (50.0) 60+ (60+)
2016 Mean 8.4 (8.2) 16.1 (15.1) 61.0 (59.2) 60+ (60+) 0.34 (0.37) 3.4 (7.3) 487 (236) 64.54 (16.26) 18.91 (14.3) 13 (14)
2015 Mean 8.5 (8.4) 15.4 (15.1) 59.7 (59.1) 60+ (60+) 0.11 (0.09) 2.3 (5.8) 1287 (197) 76.25 (15.12) 21.08 (14.49) 6 (5)
2014 Mean 8.5 (8.2) 14.3 (13.9) 57.7 (57.0) 60+ (48) 0.12 (0.16) 2.3 (6.2) 769 (479)
2013 Mean 8.3 (8.2) 15.2 (13.9) 59.3 (57.0) 49 (49) 0.17 (0.14) 2.1 (6.3) 1501 (437) <0.05 (0.08)
2012 Mean 8.3 (8.3) 17.9 (16.3) 64.1 (61.4) 60+ (60+) 0.11 (0.09) 0.9 (3.7) 2804 (230) 0.08 (0.06)
2011 Mean 8.2 (8.4) 16.2 (16.9) 61.1 (62.5) 60+ (60+) 0.07 (0.08) 2.6 (5.5) 439 (214) <0.05 (<0.05)
2010 Mean 8.1 (8.0) 16.2 (13.9) 61.1 (57.0) 60+ (60+) 0.17 (0.1) 2.5 (6.1) 1699 (436) 0.08 (<0.05)
2009 Mean 8.2 (8.2) 13.8 (13.4) 56.8 (56.1) 54 (60+) 0.12 (0.08) 1.6 (4.3) 600 (204) 0.08 (0.05)
2008 Mean 8.1 (8.1) 16.1 (15.0) 61.0 (59.1) 60 (58) 0.16 (0.12) 2.7 (5.7) 1802 (357) 0.06 (0.09) (0.09)
2007 Mean 8.2 (8.1) 16.0 (15.4) 60.7 (59.8) 52 (53) 0.14 (0.22) 2.4 (6.2) 927 (745) 0.05 (0.06) (0.11)
2006 Mean 8.2 (8.2) 16.0 (16.5) 60.7 (61.7) 49 (56) 0.12 (0.14) 2.0 (5.3) 1887 (388) 0.06 (<0.05) (0.12)
2005 Mean 8.6 (8.5) 17.8 (16.6) 64.0 (61.9) 60+ (55) 0.12 (0.11) 2.3 (5.3) 1196 (180) 0.05 (0.11) 0.95 (18.32) (0.14)
2004 Mean 0.09 (0.1) 1.7 (5.4) 257 (170) 0.05 (0.05) 0.15 (0.19)
2002 Mean 0.05 (0.21) 1.7 (5.9) <0.05 (0.15) 0.16 (0.09) 334 (32)
2001 Mean (0.14) (12.6) (0.1) (0.54) (934)
2000 Mean 0.3 (0.41) 2.3 (4.8) 0.08 (0.12) 0.24 (0.21) 1600 (157)

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 82.8% 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 Decorah Dry Run (Not part of above statistics)

Sample Date by pH

Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine - Screen ppb Membrane Fecal Coliform /100mL Chloride (Lab) mg/L Sulfate mg/L Total Suspended Solids mg/L
03/14/07 14:10 8.0 4.3 39.7 38 0.38 1.9 50 0.18
07/25/05 16:10 9.16 18.0 64.4 60+ 0.61 1.3 56000 0.25
05/25/04 13:50
05/25/04 13:50 0.17 3.1 2200 <0.05
07/29/02 19:10 0.28 2.6 <0.05 0.1 3000.0
06/04/02 21:00 0.26 1.5 0.14 0.36 25000.0
06/15/01 14:15 <0.1 2.5 <0.1 0.32 2600.0
04/03/01 16:15 <0.1 3.3 <0.1 0.14 73.0
08/17/00 14:35 0.2 1.4 <0.1 0.16 9800.0
07/05/00 14:30 0.2 2.4 <0.1 0.19 3600.0
05/18/00 19:50 0.5 0.6 0.4 0.77 12000.0
02/24/00 15:10 0.7 1.5 0.4 0.1 2800.0

Site Information

NameDecorah Dry Run
Code15-DDR-10
CountyWinneshiek
Latitude43.3047
Longitude-91.7751
UTM_X599346.0
UTM_Y4795381.0
Sampled byCity of Decorah Water Department

Sampling Location

Nearby Sampling Locations

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