Wolf Creek IA 02-CED-530
mouth (S29 T87N R11W Black Hawk Co.) to confluence with Twelvemile Cr. in S19 T86N R13W Tama Co.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:53 AM
- Updated
- 1/18/2024 1:14:47 PM
Assessment Summary
The presumptive Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "WINOFI" based on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2020-2022 10070002 Wolf Creek at La Porte
City CRWQ 23 WQ CY 2020-2022 99990048 Wolf Creek Iowa DNR 6 BIO See Below 434 Wolf Creek La Porte City (REMAP
#109) Iowa DNR 6 BIO See Below 1262 Wolf Creek La Porte City (REMAP
#402) Iowa DNR 6 WQ CY 2021 434 Wolf Creek La Porte City (REMAP
#109) Iowa DNR 6 BIO See Below 1154 Wolf Creek Main St Bridge La
Porte City
Presumptive Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10070002 6 8/8/7 146 366 540 YES 3 / 3 6 / 3 5 / 3 YES Mon Not 99990048 23 5/5/5 513 813 147 YES 3 / NA 4 / NA 3 / NA YES Eval Not Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 10070002 6 36 / 3 7.7 8.6 8.2 0 7 NO Mon Full 99990048 23 13 / 3 6.72 8.49 8.03 0 4 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 10070002 6 Chloride 36 / 3 15 25 20 NA 0 / 0 7 NO Mon Full 99990048 23 Chloride 15 / 3 14.6 26.4 19.6 NA 0 / 0 4 NO Mon Full 10070002 6 Dissolved Oxygen 36 / 3 7.3 14.1 10.7 0 NA / NA 7 NO Mon Full 99990048 23 Dissolved Oxygen 15 / 3 6.4 13.7 9 0 NA / NA 4 NO Mon Full 10070002 6 pH 36 / 3 7.7 8.6 8.2 0 NA / NA 7 NO Mon Full 99990048 23 pH 13 / 3 6.72 8.49 8.03 0 NA / NA 4 NO Mon Full 10070002 6 Sulfate 36 / 3 10 48 27 0 NA / NA 7 NO Mon Full 99990048 23 Sulfate 15 / 3 14.3 39.8 23.6 0 NA / NA 4 NO Mon Full 10070002 6 Temperature 36 / 3 0.1 25.5 11.1 0 NA / NA 7 NO Mon Full 99990048 23 Temperature 15 / 3 5.2 26.4 18.8 0 NA / NA 4 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10070002 6 Ammonia 36 / 3 0.27 0.04 0.02 0 / 0 NO Mon Full 10070002 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10070002 6 Chromium 20 / 3 3 0.69 0.5 0 / 0 NO Mon Full 10070002 6 Lead 20 / 3 1 0.92 1 0 / 0 NO Mon Full 10070002 6 Nickel 20 / 3 2.7 1.2 1 0 / 0 NO Mon Full 10070002 6 Selenium 18 / 2 2 1 1 0 / 0 NO Mon Full 10070002 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10070002 6 Zinc 20 / 3 5.8 1.3 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 1154 8/15/22 326.0 47c MS Floating Art Sub 71 Good 52 Pass 434 9/9/21 325.9 47c MS Hess 55 Fair 70 Fail 1262 8/25/20 306.0 47c MS Floating Art Sub 49 Fair 52 Fail 1154 8/15/18 326.0 47c MS Floating Art Sub 81 Excellent 52 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 434 9/9/21 325.9 47c MS No 57 Good 44 Pass 1262 8/25/20 306.0 47c MS No 61 Good 44 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (2/4) WINOFI Fish Monitored Pass (2/2) Full Assessment was evaluated because although
the BMIBI assessment used Overall Evaluated Fail WINOFI 3bc multiple samples collected in the last five
years, it was inconclusive. Class BWW1- Continuous
DO Monitoring: Site ID Data Source ID # Days Monitoring (2021) DO Criteria Type # 2021 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 0/4 No 430 6 15 16 hr 0/4 No Evaluated Full
Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value Number of Non - Detects Mean Value > Criterion or MCL Assessment Type Support Level 10070002 6 Selenium 18 / 2 2 1 1 7 NO Mon Full
Presumptive Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class HH-F - Toxic Parameters:
Assessment Key Dates
8/15/2018 | Biological Monitoring |
1/9/2020 | Monitoring Start |
12/8/2022 | Monitoring End |
8/25/2020 | Biological Monitoring |
9/9/2021 | Biological Monitoring |
8/15/2022 | Biological Monitoring |
9/9/2021 | Monitoring Start |
9/23/2021 | Monitoring End |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |