Rabbit Island Lake IA 06-WEM-1731
Monona County S28T85NR47W 10 mi. WNW of Whiting.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 9/9/2020 11:09:25 AM
- Updated
- 10/16/2020 7:56:03 AM
The Class BLW aquatic life uses remain assessed (evaluated) as "not supported" due to hydrological modifications (flow alterations and channel degradation of the Missouri River) that adversely affect this wetland. This type of impairment is appropriate for Category 4c of Iowa's Integrated Report (i.e., impairment due to a non-pollutant stressor). TAll other designated uses are “not assessed.” This assessment is the same as that developed for previous assessment/listing cycles.
Class BLW - The Class BLW aquatic life uses remain assessed (evaluated) as "not supported" due to impacts of hydrological modification of the Missouri River and resultant problems with water level fluctuation in the river's floodplain wetlands (see assessments developed for previous Section 305(b) reporting cycles). Watershed modeling completed on Rabbit Island Lake indicates that sediment delivery to the wetland from the watershed is very low. In addition, the local DNR biologist indicates that the Missouri River does not breach the original high bank, but occasionally (10 -15 years) flood waters do enter wetlands such as Rabbit Island Lake that are adjacent to the river. The impact from hydrologic modification of the Missouri River, and the related problems with maintaining adequate water levels in this riverine wetland, remain. Class HH - Fish Tissue sampling: No Data In general, Iowa wetlands are not managed for recreational fisheries; thus, fish contaminant monitoring is not typically conducted at these waterbodies. Note: this assessment has not been updated following the severe flooding of the Missouri River during summer 2011 and thus does not reflect flood-related changes that may have occurred at this floodplain wetland.
The assessment category for this wetland is "evaluated."In terms of Section 305(b) reporting, "monitored assessments" are based primarily on recent, site-specific ambient monitoring data and thus have relatively high confidence. DNR considers waterbodies identified as "impaired" based on "monitored assessments" as candidates for the state's Section 303(d) list. "Evaluated assessments" are those based on data older than five years or other than site-specific ambient monitoring data (e.g., desktop models or questionnaire surveys of fish and game biologists [=best professional judgment]) and thus have relatively lower confidence. DNR does not consider waterbodies identified as "impaired" based on "evaluated assessments" as candidates for the state's Section 303(d) list.
None listed