Little Waterman Creek IA 06-LSR-1621
mouth (S4 T95N R39W O'Brien Co.) to headwaters in S15 T96N R40W O'Brien Co.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 3 - Insufficient data exist to determine whether any designated uses are met.
- Trend
- Declining
- Trend Comment
- New presumptive Class BWW1 benthic macroinvertebrate WINOFI listing (potential impairment).
- Created
- 10/27/2025 3:08:47 PM
- Updated
- 2/11/2026 9:39:27 AM
The presumptive Class BWW1 use was assessed as “WINOFI” based on biological sampling data. All other designated uses were "not assessed."
Data Source: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 50 Little Waterman
Creek Waterman Creek SWMA
-Hartley Presumptive Class BWW1 - Biological Sampling: Benthic Macroinvertebrates: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/Fail 50 9/16/24 17.1 47a MO Surber 52 Fair 54 Fail 50 8/23/23 17.1 47a MO Surber 51 Fair 54 Fail 50 7/27/22 17.1 47a MO Surber 47 Fair 54 Fail 50 7/20/21 17.1 47a MO Surber 63 Good 54 Pass 50 8/5/20 17.1 47a MO Surber 55 Fair 54 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/Fail 50 9/16/24 17.1 47a MO NA 58 Good 43 Pass 50 8/23/23 17.1 47a MO NA 55 Good 43 Pass 50 7/27/22 17.1 47a MO NA 59 Good 43 Pass 50 7/20/21 17.1 47a MO NA 46 Fair 43 Pass 50 8/5/20 17.1 47a MO NA 47 Fair 43 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (2/5) WINOFI Fish Evaluated Pass (5/5) Full Assessment was
evaluated because the drainage area of Overall Evaluated Fail WINOFI 3bu the sample site was
smaller than the calibrated range.
Presumptive Class A1 – No Data
Fish:
Overall: