Buffalo Creek IA 01-WPS-374
from the Jones/Linn county line (NW 1/4 S19 T85N R4W Jones Co.) to confluence with Boulder Cr. in NE 1/4 S30 T86N R5W Linn Co.
- 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 BWW1 benthic macroinvertebrate impairment.
- Created
- 10/27/2025 3:09:31 PM
- Updated
- 12/2/2025 8:32:10 AM
The Class BWW1 use was assessed as "not supported" based on biological sampling data. The Class HH use was assessed as "fully supported" based on fish tissue sampling 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 61 Buffalo Creek Central City Iowa DNR 6 FT See Below 1353 Buffalo Creek Central City Class BWW1 - Biological Sampling: Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 61 8/19/24 184.8 47c MS/WW Hess 67 Good 70 Fail 61 7/26/21 184.8 47c MS/WW Hess 69 Good 70 Fail BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Site? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 61 8/19/24 184.8 47c MS/WW Yes 74 Excellent 65 Pass 61 7/26/21 184.8 47c MS/WW Yes 76 Excellent 65 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Fail (0/2) Not Fish Monitored Pass (2/2) Full Assessment was monitored because the assessment was Overall Monitored Fail Not 5bv completed using samples collected in a recent five-year period. Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) 1353 tissue plug 2016 smallmouth bass 3 33.1 0.05 Support Level Full
Class A1 - No Data
Fish:
Overall Assessment:
Class HH - Fish Tissue Sampling: