East Indian Creek IA 03-SSK-947
mouth to trib S34T85NR22W Story Co.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 3 - Insufficient data exist to determine whether any designated uses are met.
- Trend
- Stable
- Created
- 10/27/2025 3:11:17 PM
- Updated
- 12/23/2025 4:17:20 AM
The Class A1 use was assessed (evaluated) as "WINOFI” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. All other designated uses were "not assessed."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Story Co. 26 WQ CY 2022-2024 99990164 East
Indian Creek Site
monitored by Prairie River Watershed Group and Story Co. Conservation 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 99990164 26 8/9/8 414 221 628 YES 6 / 3 6 / 3 6 / 3 YES EVALUATED NOT 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
as appropriate for listing under Category 3b of the Integrated Report (waters
potentially impaired and in need of further investigation).
Class BWW2 - No Data
Presumptive Class A1 - Indicator Bacteria: