Dry Creek IA 06-BSR-1878
mouth (T94N R48W Sec4 Sioux Co.) to headwaters (T97N R45W Sec32) Sioux Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/8/2023 1:33:32 PM
- Updated
- 1/24/2024 11:21:30 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2006 | Class BWW1 | Fish Kill: Due To Natural Causes | Biological monitoring: Iowa DNR fish kill follow-up | New data: recovery of fish community from pollutant-caused fish kill |
The presumptive Class BWW1 use was assessed as “not supported” based on biological sampling data. The apparent lack of fish in portions of this segment, as documented by the 2004-2006 biological sampling data, continues to suggest a severe water quality impact impairment that justifies keeping this segment on Iowa’s Section 303(d) list. However the downstream portion of the segment (downstream of the fish kill event) showed overwhelming amount of recent evidence of fish community recovery, therefore delisting the fish kill for this segment. 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 393 Dry Creek Hawarden – REMAP #103 Iowa DNR 6 BIO See Below 470 Dry Creek Sioux Center – REMAP #144 Iowa DNR 6 WQ 2021 393 Dry Creek Iowa DNR 6 BIO See Below 612 Dry Creek Hawarden – REMAP #219 BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/Fail 612 7/12/06 40 47a MO Hess 42 Fair 54 Fail 470 7/5/05 9 47a MO Hess 40 Fair 54 Fail 393 6/28/04 36 47a MO Hess 28 Poor 54 Fail BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/Fail 612 7/12/06 40 47a MO NA 0 Poor 43 Fail 470 7/5/05 9 47a MO NA 0 Poor 43 Fail 393 6/28/04 36 47a MO NA 0 Poor 43 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/3) Not Fish Evaluated Fail (0/3) Not Assessment was evaluated because the
drainage areas of Overall Evaluated Fail Not 5bt the sample sites were smaller than the
calibrated range. BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Fish per mile 47a REMAP 25 % fish per mile >47a REMAP 25 % fish per mile? 2024 IR 47a expected fish taxa Fish Taxa Present % (>50% to
pass) 1401 10/10/22 49.9 47a MO/WW 6864 496 Yes (Pass) 7/10 70% (Pass) The presumptive Class BWW1 use previously resided in Category
5b based on a fish kill that occurred in 2003. This segment’s fish community
was sampled in 2022 as part of the DNR fish kill follow-up sampling program.
The results from this follow-up sampling and comparison to ecoregion averages
suggest that the fish community of this segment is similar to non-fish kill
impacted streams. Based on the fish kill follow-up sampling results, the
Category for the fish kill assessment was changed from 5b to 3a (not
assessed). More details about the 2003 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/573 Site ID Data Source ID # Days Monitoring (2021) DO Criteria Type # 2021 violations / Violations needed
for impairment Violates Annual Significantly >10%
Rule? Assessment Type Support Level 24 hr 6/4 Yes 393 6 15 16 hr 3/4 No Evaluated WINOFI
Presumptive Class A1 - No Data
Presumptive Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Presumptive Class BWW1 – Fish kill Assessment:
Presumptive Class BWW1- Continuous DO Monitoring: