Impaired Water - Sauk Creek (Sauk Creek)
Ozaukee County, Wisconsin
SH01
49500
0.00 - 15.90
15.90
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This segment of Sauk Creek was evaluated for phosphorus and biology every two years between 2012 and 2022. Phosphorus levels were found to be too high.
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
High Phosphorus Levels
Current Use
FAL - Fish and Aquatic Life Community
Listing Status
TMDL Development
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
High
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
2012-909
Listing Date
4/1/2012
Impaired Water Notes
Water chemistry and biological parameters were taken at all seven monitoring stations. Six total phosphorus samples were taken at SC-1 (SWIMS Station ID; 10030655) throughout the growing season (May � October) and one phosphorus grab sample was taken at the other 6 monitoring stations. Dissolved oxygen was taken once at each of the monitoring stations during 2014 and ranged from 0.83mg/L (SC-6) to 11.6mg/L (SC-1).
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The Hilsenhoff�s Biotic Index ranged Poor with a score 7.527 (SC-2) to Very Good with a score of 4.497 (SC-1). The Macroinvertebrate IBI (MIBI) score ranged from 0.8386 (Poor) to 7.142 (Good). The Fish IBI (FIBI) score ranged from Poor with a score of 30 (SC-6) to Excellent with a score of 100 (SC-4 and SC-7).

Seven monitoring stations were sampled during the 2014 field season in the Suck Creek TWA. Based on fish surveys in the watershed, the modeled natural communities at each of the seven monitoring stations were able to be verified. Sauk Creek has a cool-warm natural community at 6 of the seven monitoring stations. Fish surveyed at Station ID 10030655 indicate a cool-cold transition headwater natural community, not the modeled natural community of cool-warm transition headwater
Date
8/9/2017

Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category).
Date
2/26/2014

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceed 2016 WisCALM listing thresholds for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category).
Date
9/23/2015

Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data overwhelmingly exceed 2020 WisCALM listing criteria for the Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category). Based on the most updated information, no change in existing impaired waters listing is needed.
Date
7/29/2019

Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data overwhelmingly exceed 2020 WisCALM listing criteria for the Aquatic Life use. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
5/21/2021