McLoud Run IA 02-CED-508
Alternate name(s) for this segment: Cold Stream
mouth (SW 1/4 S16 T83N R7W Linn Co.) to headwaters in SW 1/4 S5 T83N R7W 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
- Continued fish kills.
- Created
- 10/27/2025 3:09:33 PM
- Updated
- 12/19/2025 8:30:56 AM
The presumptive Class A1 use remains assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The presumptive Class BWW1 use was assessed as "not supported" due to multiple fish kill investigations. All other designated uses were "not assessed." Note: The previous impairment of this stream was due to fish kills related to high-temperature stormwater from summer precipitation events in the primarily urban watershed of McLoud Run. A TMDL for these thermal impacts was prepared by DNR and approved by U.S. EPA in 2007. Because, however, this TMDL did not address the potential causes of more recent fish kills (e.g., discharge of chlorinated water to the stream), this aquatic life use remains Section 303(d)-impaired and in Category 5b of Iowa's Integrated Report.
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2010-2011 15570003 McLoud Run Site ID Data Source ID # Samples / # Years 2010 Geometric Mean 2011 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15570003 6 23 / 2 889 1282 Yes 22 96% Yes Evaluated Not Presumptive Class BWW1 – Fish Kill Assessment:
BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Fish per mile 47c REMAP 25 % fish per mile >47c REMAP 25 % fish per mile? 47c expected fish taxa Fish Taxa Present % (>50% to pass) 1427 07/20/2023 4.12 47c MS/WW 2714 2992 No (Fail) 4/12 33% (Fail) The presumptive Class
BWW1 use remains in Category 5b following a 2023 fish kill follow-up
assessment that found the resident fish community to be below ecoregion expectations.
The aquatic life use is designated as a BWW1 (warm water) stream, however the
fish community from this stream more closely resembles a community from a
cold water stream and is also a listed
trout stream on
the Iowa
DNR fisheries trout stream web page. The WQMA section is currently evaluating the proper aquatic
life designation for this stream. Details about the September 2024 fish kill caused by chlorinated water can be found here: https://programs.iowadnr.gov/fishkill/events/1071 Details
about the January 2024 fish kill caused by chlorinated water can be found here: https://programs.iowadnr.gov/fishkill/Events/1052 Details about the April 2023 fish kill caused by chlorinated water can be found here:https://programs.iowadnr.gov/fishkill/events/1036
Cedar Rapids
Iowa DNR 6 BIO See Below 1427 McLoud Run Cedar Rapids
Presumptive Class A1 - Indicator Bacteria: 2010-2011
A
total of 10 fish kills occurred in this segment from 1997-2018. For more
information on those historic fish kills, see previous IR assessments for this
segment for view the fish kills in the Iowa Fish Kill Database - https://programs.iowadnr.gov/adbnet/Segments/508