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
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/22/2021 12:40:38 PM
- Updated
- 1/13/2022 9:31:33 AM
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. All other designated uses were "not assessed."
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2018-2020 10070002 Wolf Creek at La Porte City
CRWQ 23 WQ CY 2018-2020 99990048 Wolf Creek
Iowa DNR 6 BIO See Below 1262 Wolf
Creek LaPorte
City – REMAP #402 Iowa DNR 6 BIO See Below 1154 Wolf
Creek Main
St Bridge – LaPorte City Presumptive Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10070002 6 6/8/8 492 414 146 YES 4 / NA 5 / 3 3 / 3 YES Monitored Not 99990048 23 5/5/5 836 511 513 YES 5 / NA 4 / NA 3 / NA NA Evaluated Not Class A - pH 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 8.4 8.1 0 7 NO Monitored Full 99990048 23 13 / 3 6.72 8.27 7.89 0 4 NO Monitored Full Class BWW1 -
Conventional Parameters: 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 Ammonia 36 / 3 0.02 0.26 0.04 NA 0 / 0 7 NO Monitored Full 10070002 6 Chloride 36 / 3 15 24 18 NA 0 / 0 7 NO Monitored Full 99990048 23 Chloride 15 / 3 8.8 26.4 17.3 NA 0 / 0 4 NO Monitored Full 10070002 6 Dissolved Oxygen 36 / 3 7.7 13.7 10.5 0 NA / NA 7 NO Monitored Full 99990048 23 Dissolved Oxygen 14 / 3 5.9 11.6 8 0 NA / NA 4 NO Monitored Full 10070002 6 pH 36 / 3 7 8.4 8.1 0 NA / NA 7 NO Monitored Full 99990048 23 pH 13 / 3 6.72 8.27 7.89 0 NA / NA 4 NO Monitored Full 10070002 6 Sulfate 36 / 3 11 43 21 0 NA / NA 7 NO Monitored Full 99990048 23 Sulfate 15 / 3 8.5 39.8 21.1 0 NA / NA 4 NO Monitored Full 10070002 6 Temperature 36 / 3 0.2 25.5 11.6 0 NA / NA 7 NO Monitored Full 99990048 23 Temperature 15 / 3 9.6 23.9 18.9 0 NA / NA 4 NO Monitored Full Class BWW1 -
Toxic Parameters: 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 Aluminum 14 / 3 4.1 1.3 0.7 0 / 0 NO Monitored Full 10070002 6 Arsenic 13 / 3 1.2 0.7 0.7 0 / 0 NO Monitored Full 10070002 6 Cadmium 13 / 3 0.07 0.03 0.02 0 / 0 NO Monitored Full 10070002 6 Chromium 13 / 3 1.2 0.8 0.8 0 / 0 NO Monitored Full 10070002 6 Lead 13 / 3 0.25 0.11 0.08 0 / 0 NO Monitored Full 10070002 6 Nickel 13 / 3 2.9 2.2 2.3 0 / 0 NO Monitored Full 10070002 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10070002 6 Zinc 13 / 3 4.4 2 1.8 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/ Fail 1262 8/25/20 306 47c MS Floating Art Sub 49 Fair 52 Fail 1154 8/15/18 326 47c MS Floating Art Sub 81 Excellent 52 Pass Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/ Fail 1262 8/25/20 306 47c MS No 61 Good 44 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/2) Not
Fish Evaluated Pass (1/1) Full 3bc Assessment was evaluated
because although the BMIBI assessment used Overall Evaluated Fail WINOFI multiple samples
collected in the last five years, it was inconclusive.
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class
HH – No Data
Assessment Key Dates
8/15/2018 | Biological Monitoring |
1/8/2018 | Fixed Monitoring Start Date |
12/7/2020 | Fixed Monitoring End Date |
8/25/2020 | Biological Monitoring |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |