Decorah Dry Run [15-DDR-10]

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

Sampling Location

Yearly Averages for Decorah Dry Run [15-DDR-10] Download in CSV format
(with comparison to all locations in the watershed)

pH

 Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine ppb Fecal Coliform /100mL Chloride mg/L Sulfate mg/L Total Suspended Solids mg/L
All Years 8.3 (8.2) 15.4 (14.9) 59.7 (58.9) 60+ (60+) 0.12 (0.12) 2.2 (5.6) 773 (272) 0.06 (0.07) 0.95 (18.32) 0.18 (0.14) 780 (13321) 68.62 (14.45) 20.2 (14.65) 11 (19)
2022 Mean 8.4 (7.9) 15.0 (15.9) 59.1 (60.7) 60+ (60+) 0.08 (0.09) 2.1 (6.1) 325 (250) 75.07 (14.69) 20.07 (15.44) 5 (14)
2021 Mean 8.5 (8.1) 16.4 (15.5) 61.5 (59.8) 60+ (60+) 0.05 (0.06) 1.8 (4.5) 791 (166) 57.76 (13.83) 21.34 (16.38) 7 (7)
2020 Mean 8.5 (8.1) 12.6 (13.0) 54.7 (55.5) 60+ (60+) 0.06 (0.06) 2.4 (5.2) 387 (121) 66.07 (13.01) 20.27 (14.7) 12 (10)
2019 Mean 8.2 (7.9) 14.0 (13.9) 57.2 (57.0) 60+ (60+) 0.12 (0.11) 2.4 (5.6) 507 (189) 62.64 (12.79) 18.83 (13.72) 14 (10)
2018 Mean 8.6 (8.2) 13.9 (14.1) 57.0 (57.4) 59 (43) 0.14 (0.26) 2.3 (6.1) 258 (391) 78.07 (14.8) 19.63 (13.58) 22 (72)
2017 Mean 8.5 (8.1) 14.1 (14.7) 57.4 (58.4) 60+ (59) 0.11 (0.12) 2.5 (5.7) 490 (359) 71.84 (15.39) 21.83 (14.51) 8 (15)
2016 Mean 8.4 (8.2) 16.1 (15.1) 61.0 (59.2) 60+ (60+) 0.11 (0.12) 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) 370 (11159)
2001 Mean (0.14) (12.6) (0.1) (0.54) (10137)
2000 Mean 0.3 (0.41) 2.3 (4.8) 0.08 (0.12) 0.24 (0.21) 1600 (18412)

*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 78.9% 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).

Download in CSV format

Monthly Water Sampling Data for Decorah Dry Run [15-DDR-10]

Sample Date Time by pH

 Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine ppb Fecal Coliform /100mL Chloride mg/L Sulfate mg/L Total Suspended Solids mg/L
10/11/22 09:00 Dennis Myhre 8.33 11.2 52.2 60+ 0.1 2.0 253 82.8 21.0 4.8
09/13/22 11:05 Dennis Myhre 8.42 15.1 59.2 60+ 0.07 2.2 435 84.1 18.6 4
08/09/22 08:55 Dennis Myhre 8.38 15.9 60.6 60+ 0.11 2.5 706 85.3 20.2 1.2
07/12/22 08:55 Dennis Myhre 8.37 17.5 63.5 60+ 0.06 2.6 563 81.7 21.2 10
06/14/22 08:55 Dennis Myhre 8.3 19.3 66.7 60+ 0.08 2.4 2187 75.6 21.0 7.6
05/10/22 08:50 Dennis Myhre 8.26 17.4 63.3 24 0.06 1.5 399 44.4 14.0 9.2
04/12/22 11:13 Dennis Myhre 8.54 8.9 48.0 60+ 0.06 1.7 10 71.6 24.5 0.4
10/12/21 08:50 Dennis Myhre 8.33 13.9 57.0 60+ 0.07 1.1 1076 35.4 13.6 2.4
09/14/21 09:10 Dennis Myhre 8.41 17.3 63.1 60+ 0.05 1.9 450 68.3 21.3 5.2
08/10/21 09:00 Dennis Myhre 8.46 22.5 72.5 60+ 0.08 1.8 9208 61.5 23.2 13.5
07/13/21 09:10 Dennis Myhre 8.47 20.7 69.3 60+ 0.05 1.7 1314 58.6 23.1 4
06/08/21 09:15 Dennis Myhre 8.5 22.2 72.0 60+ 0.05 1.9 7270 57.9 22.5 13.6
05/11/21 09:00 Dennis Myhre 8.57 10.7 51.3 60+ 0.04 2.0 228 58.5 22.7 7.2
04/13/21 09:05 Dennis Myhre 8.55 7.2 45.0 60+ 0.02 2.3 20 64.1 23.0 1.6
10/13/20 08:55 Dennis Myhre 8.36 11.2 52.2 60+ 0.07 1.7 813 51.9 16.3 2.4
09/08/20 10:55 Dennis Myhre 8.52 13.0 55.4 60+ 0.07 2.4 677 52.7 19.0 8.8
08/11/20 09:05 Dennis Myhre 8.43 16.2 61.2 60+ 0.06 2.7 576 70.3 22.2 8
07/14/20 08:50 Dennis Myhre 8.45 17.0 62.6 60+ 0.09 2.7 2187 70.7 20.5 20.4
06/09/20 09:00 Dennis Myhre 8.46 16.5 61.7 37 0.09 2.5 4611 70.1 20.6 26.8
05/12/20 09:15 Dennis Myhre 8.73 9.8 49.6 60+ 0.02 2.1 41 70.5 22.0 8
04/14/20 09:10 Dennis Myhre 8.54 4.6 40.3 60+ 0.05 2.8 10 76.3 21.3 12
10/08/19 09:30 Dennis Myhre 7.14 10.6 51.1 60+ 0.14 2.7 246 62.2 20.6 4.4
09/10/19 00:00 Dennis Myhre 0.18 1.3 14136 23.1 8.2 41
08/13/19 08:14 Dennis Myhre 8.4 18.2 64.8 60+ 0.09 2.5 1989 62.3 19.9 3.2
07/09/19 09:05 Dennis Myhre 8.46 15.9 60.6 60+ 0.09 2.6 538 65.4 20.0 5
06/11/19 09:05 Dennis Myhre 8.45 13.8 56.8 60+ 0.1 2.5 1187 73.2 21.3 5.5
05/14/19 09:00 Dennis Myhre 8.6 11.4 52.5 60+ 2.3 63 73.0 20.8 21
04/09/19 00:00 0.09 2.6 31 79.3 21.0 17.2
10/09/18 09:00 Dennis Myhre 8.42 14.6 58.3 12 0.38 2.1 2489 45.5 14.6 96
09/11/18 09:05 Dennis Myhre 8.63 14.3 57.7 60+ 0.1 2.7 74 80.4 21.2 8
08/14/18 09:10 Dennis Myhre 8.62 18.3 64.9 60+ 0.11 2.3 663 73.9 22.2 11.6
07/10/18 08:11 8.61 15.1 59.2 61.2 0.07 2.6 422 82.4 19.8 6.5
06/12/18 09:10 Dennis Myhre 8.35 15.9 60.6 55 0.17 2.1 1782 78.9 18.3 25
05/08/18 09:10 Dennis Myhre 8.64 12.1 53.8 60+ 0.1 2.6 41 86.1 20.5 1
04/17/18 10:53 Jeremy Carolan 8.64 7.0 44.6 60+ 0.08 1.8 20 99.3 20.8 6.5
10/10/17 08:50 Dennis Myhre 8.66 10.8 51.4 60+ 0.13 2.0 909 58.4 23.2 2
09/12/17 09:10 Dennis Myhre 8.61 15.3 59.5 60+ 0.09 2.1 1500 58.2 24.7 5.2
08/08/17 08:55 Dennis Myhre 8.6 16.5 61.7 60+ 0.09 2.5 67.3 22.7 8
07/11/17 09:00 Dennis Myhre 8.51 18.9 66.0 60+ 0.12 2.8 2064 71.5 21.7 5.5
06/13/17 09:00 Dennis Myhre 8.35 18.7 65.7 60+ 0.14 2.8 7270 84.3 20.5 14.8
05/09/17 11:10 Dennis Myhre 8.46 13.3 55.9 60+ 0.11 2.7 85 80.2 20.1 10
04/11/17 08:11 Jeremy Carolan 8.4 5.2 41.4 60+ 0.09 2.3 <10 83.0 19.9 12.4
10/11/16 09:05 Dennis Myhre 8.3 13.5 56.3 60+ 0.19 8.6 1354 19.8 17.9 5
09/13/16 09:00 Dennis Myhre 8.1 14.0 57.2 38 0.16 2.7 1968 68.0 19.3 18.5
08/09/16 08:55 Dennis Myhre 8.5 17.4 63.3 60+ 0.11 3.2 932 84.1 21.7 8.8
07/12/16 13:45 Dennis Myhre 8.34 23.4 74.1 60+ 0.05 1.9 2046 57.0 17.3 14.3
06/14/16 09:10 Dennis Myhre 8.43 18.5 65.3 60+ 0.1 2.9 820 88.7 22.1 21.5
05/10/16 09:00 Dennis Myhre 8.3 12.9 55.2 60+ 0.09 1.7 45.9 12.5 15.5
04/12/16 14:20 8.77 13.0 55.4 60+ 0.07 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
  • 05/10/2022: 1 in of rain last night
  • 09/10/2019: Field sheet missing
  • 04/09/2019: Field sheet missing
  • 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

One-time Rainfall Event Samples for Decorah Dry Run (Not part of above statistics)

Sample Date Time by pH

 Celsius C Fahrenheit F Transparency cm P mg/L N mg/L E. Coli MPN/100mL Ammonia mg/L Flow cfs Atrazine ppb Fecal Coliform /100mL Chloride 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

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