Unnamed Creek, Silver Creek Watershed @ Dolphin Ave [UNS-15]

NameUnnamed Creek, Silver Creek Watershed @ Dolphin Ave
CodeUNS-15
CountyClayton
Latitude43.0342
Longitude-91.4587
NotesAdded Apr 2013
HUC_87060004
Sampled byClayton County Soil and Water Conservation District

Sampling Location

Yearly Averages for Unnamed Creek, Silver Creek Watershed @ Dolphin Ave [UNS-15] Download in CSV format
(with comparison to all locations 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) 82 (<33) 14.0 (15.6) 57.2 (60.0) 33 (52) 8.5 (8.6) 1.69 (0.21) 8.7 (6.7) 650 (372) 0.9 (0.09) 22 (29) 125.11 (27.87) 34.24 (22.17)
2019 Mean 8.4 (8.4) 28 (29) 0.49 (0.5) 8.3 (8.5) 384 (1160) 24 (25) 73.76 (34.3) 25.0 (20.61)
2018 Mean 1.31 (0.24) 7.9 (8.8) 95 (269) 26 (16) 128.02 (34.33) 38.1 (21.18)
2017 Mean 8.2 (8.3) 14.0 (13.2) 57.2 (55.8) 35 (35) 2.71 (0.51) 5.5 (8.8) 587 (298) 20 (79) 145.9 (34.35) 35.77 (19.7)
2015 Mean 8.1 (8.3) 71 (<33) 19.8 (17.3) 67.7 (63.1) 42 (53) 6.0 (7.2) 3.27 (0.23) 14.6 (6.1) 343 (442) 11 (20) 172.05 (22.17) 40.35 (23.58)
2014 Mean 8.3 (8.2) 113 (<33) 12.8 (14.6) 55.1 (58.3) 51 (57) 8.8 (8.4) 2.25 (0.18) 12.0 (7.3) 15704 (196)
2013 Mean 8.2 (8.2) 62 (<33) 12.7 (13.6) 54.8 (56.5) 19 (46) 9.2 (8.8) 1.43 (0.27) 9.4 (7.6) 947 (960) 0.9 (0.13)

*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 37.9% 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 70.4% 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 Unnamed Creek, Silver Creek Watershed @ Dolphin Ave [UNS-15]

Sample Date Time 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
10/01/19 00:00 Eric Palas 7.7 10 0.75 5.6 11588 25.4 14.3
09/10/19 00:00 Eric Palas 0.0
08/06/19 00:00 Eric Palas 0.0
07/08/19 00:00 Eric Palas 8.8 35 0.43 8.0 546 25.5 78.6 23.9
06/04/19 00:00 Eric Palas 8.5 26 0.15 10.6 529 8.5 52.8 22.9
05/07/19 00:00 Eric Palas 8.5 38 0.91 9.0 249 18 88.9 33.0
04/02/19 00:00 Eric Palas 8.5 30 1.16 8.3 10 43.6 123.1 30.9
09/18/18 00:00 Eric Palas 0.56 6.6 145 7.6 22.0 20.1
08/14/18 00:00 Eric Palas 1.55 12.5 10 38.4 316.39 64.4
07/11/18 00:00 Eric Palas 0.17 3.3 148 8.5 138.9 42.1
06/12/18 00:00 Eric Palas 12.3 132 60.5 65.7 22.2
05/07/18 00:00 Eric Palas 0.27 10.8 275 2.5 71.4 28.1
04/10/18 00:00 Eric Palas 3.98 1.6 36.5 153.7 51.7
11/01/17 00:00 Eric Palas 8.6 6.6 43.9 45 4.23 2.4 637 13.2 185.8 62.9
09/26/17 00:00 Eric Palas 7.9 20.2 68.4 15 4.53 3.9 24196+ 56.8 175.0 50.5
09/05/17 00:00 Eric Palas 8.5 14.1 57.4 25 3.64 7.5 275 0 264.8 54.1
07/25/17 00:00 Eric Palas 8.3 16.6 61.9 52 1.33 9.6 63 3.5 109.5 30.4
06/27/17 00:00 Eric Palas 8.2 16.1 61.0 15 0.9 12033 39.6 170.6 22.7
05/30/17 00:00 Eric Palas 8.2 13.3 55.9 43 1.38 4.2 120 8 51.7 4.1
04/25/17 00:00 Eric Palas 8.0 11.1 52.0 51 1.13 10.1 52 19.2 63.9 25.7
10/27/15 14:30 Eric Palas
09/29/15 15:15 Eric Palas
08/25/15 14:15 Eric Palas
07/28/15 13:15 Eric Palas 8.1 71 23.2 73.8 45 5 5.32 4.9 292 2 253.3 56.4
06/30/15 14:00 Eric Palas 8.1 71 16.4 61.5 39 7 1.21 24.3 404 19.5 90.8 24.3
11/05/14 15:00 Eric Palas
10/01/14 14:40 Brad Crawford
09/03/14 13:50 Eric Palas
08/06/14 14:15 Eric Palas
07/09/14 14:00 Eric Palas 8.1 63 20.2 68.4 51 8 1.1 12.0 16000
06/04/14 14:30 Eric Palas 8.1 160 18.6 65.5 47 6 3.6 11.0 5500
05/07/14 14:05 Eric Palas 8.3 80 11.1 52.0 60+ 10 1.3 12.0 24000
04/02/14 15:05 Eric Palas 8.7 147 1.3 34.3 35 11 3.0 13.0 24000+
11/06/13 15:30 Eric Palas
10/16/13 14:30 Eric Palas
09/04/13 13:45 Eric Palas
08/07/13 14:15 Eric Palas 8.3 30 15.7 60.3 15 9 0.27 9.6 460 <0.05
07/10/13 15:10 Brad Crawford 8.13 48 19.1 66.4 51 7 0.8 13.0 680 0.99
06/05/13 16:40 Eric Palas 8.2 48 12.7 54.9 10 8 0.8 9.1 3900 0.4
05/01/13 14:00 Eric Palas 8.4 150 12.4 54.3 14 10 3.3 7.9 660 2.3
04/10/13 13:50 Eric Palas 8.2 33 3.4 38.1 3 12 2.0 7.4 0.75
  • 10/01/2019: heavy rain
  • 09/10/2019: dry
  • 08/06/2019: dry
  • 09/26/2017: 1.6" rainfall
  • 10/27/2015: Dry stream segment
  • 09/29/2015: dry stream segment
  • 08/25/2015: No streamflow
  • 06/30/2015: 0.6 inches rain on 6/29 at Monona
  • 11/05/2014: no flow
  • 10/01/2014: dry, not sampled
  • 09/03/2014: dry stream segment
  • 08/06/2014: Stream segment dry
  • 11/06/2013: Insufficient flow for sampling
  • 10/16/2013: Stream Dry
  • 09/04/2013: No Flow
  • 08/07/2013: No flow from east unnamed tributary. Flow sampled from north tributary. Sampled west of bridge.
  • 04/10/2013: Turbid

Nearby Sampling Locations

← Upstream

Downstream →