Unnamed Tributary to Mississippi River IA 01-NEM-6333
from mouth (T99N R4W Sec12 Allamakee Co.) to headwaters (T99N R4W Sec15 Allamakee Co.)
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Stable
- Created
- 10/27/2025 3:10:24 PM
- Updated
- 12/23/2025 11:23:53 AM
The presumptive Class BWW1 use was assessed as "fully supported" based on biological sampling data and on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau. All other designated uses were "not assessed." Although not designated for the coldwater aquatic life use in the Iowa Surface Water Classification Document, this segment was assessed using DNR's coldwater assessment methodology based on the presence of naturally reproducing trout in this segment.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 726 Unnamed Tributary to Mississippi River Lansing WMA – HW69 Presumptive Class BWW1 - Biological Sampling: Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/Fail 726 8/8/16 3.0 52b MS Surber 74 NA 60 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Pass (1/1) Full 1 Assessment was
evaluated because it was based on an old single sample.
Aquatic Life Use - Trout Natural Reproduction
Based on the latest trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau, the aquatic life use was assessed as "fully supported." According to the summary, a portion, or all, of this assessment unit was placed in Category I: streams that exhibit consistent natural reproduction and maintain a wild population of one or more trout species without any stocking.
Presumptive Class A1 - No Data
Overall: