Bear Creek IA 03-SSK-958
mouth to north line of S32 T85N R23W Story Co.
The presumptive Class A1 use was assessed as "WINOFI" based on indicator bacteria (E. coli) sampling data. The Class BWW2 use was assessed as "fully supported" based on biological sampling data.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Story Co. 26 WQ CY 2022-2024 99990160 Bear
Creek Site
monitored by Prairie River Watershed Group and Story Co. Conservation Iowa DNR 6 BIO See Below 114 Bear
Creek Skunk
River Greenbelt - Ames Presumptive Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2022/ 2023/2024) 2022 Geometric Mean 2023 Geometric Mean 2024 Geometric Mean Violates Annual Geometric Mean? # 2022 SSM violations / SSM Violations needed for impairment # 2023 SSM violations / SSM Violations needed for impairment # 2024 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 99990160 26 7/9/8 230 401 362 YES 4 / 3 6 / 3 6 / 3 YES EVALUATED WINOFI The bacteria samples were collected by the Prairie Rivers Watershed Group and Story County Conservation with the analyses conducted by the City of Ames. Since the data were not collected under a DNR-approved quality assurance plan, the assessment was considered "evaluated" instead of "monitored." According to Iowa DNR’s assessment/listing methodology, impairments based on “evaluated” assessments are of lesser confidence and are not appropriate for Section 303(d) listing (Category 5 of the Integrated Report). The Iowa DNR does, however, consider these assessments appropriate for listing under Category 3b of the Integrated Report (waters potentially impaired and in need of further investigation). Class BWW2 -
Biological Sampling: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47b BMIBI BIT BMIBI Pass/Fail 114 7/17/24 28.2 47b MS/WW Surber 69 Good 62 Pass BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47b FIBI BIT FIBI Pass/Fail 114 7/17/24 28.2 47b MS/WW No 47 Fair 32 Pass 114 7/16/21 28.2 47b MS/WW No 34 Fair 32 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Pass (1/1) Full Fish Monitored Pass (2/2) Full Assessment was
monitored because the fish samples used for Overall Monitored Pass Full 1 the assessment were
collected in a recent five year period.
Benthic Macroinvertebrates:
Fish:
Overall: