Shoal Creek IA 05-CHA-1342
IA/MO ln to trib S28T68NR19W Appanoose
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Declining
- Trend Comment
- New Class BWW2 benthic macroinvertebrate impairment.
- Created
- 10/27/2025 3:08:56 PM
- Updated
- 1/6/2026 2:27:00 PM
The Class BWW2 use was assessed as “not supported” based on biological sampling data and assessed as "WINOFI" based on continuous dissolved oxygen monitoring data. All other designated uses were "not assessed."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 1263 Shoal Creek Exline – REMAP #289 Iowa DNR 6 BIO & WQ See Below 218 Shoal Creek Exline Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/Fail 218 8/26/24 61.8 40a MO Art Sub 29 Poor 41 Fail 1263 7/29/20 66 40a MO Art Sub 36 Fair 41 Fail 218 7/29/20 61.8 40a MO Art Sub 43 Fair 41 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/Fail 218 8/26/24 61.8 40a MO NA 42 Fair 33 Pass 1263 7/29/20 66 40a MO NA 40 Fair 33 Pass 218 7/29/20 61.8 40a MO NA 35 Fair 33 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Fail (1/3) Not Fish Monitored Pass (3/3) Full Assessment was monitored because the samples
used to complete Overall Monitored Fail Not 5bv the assessment were collected in a recent
five-year period. Site ID Data Source ID # Days Monitoring (2016) DO Criteria Type # 2016 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 13/11 Yes 218 6 71 16 hr 14/11 Yes Evaluated WINOFI
Presumptive Class A1 - No Data
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class BWW2- Continuous DO Monitoring: