Assessment Comments
Assessment is based on results of IDNR/UHL biological (biocriteria) monitoring in 2001: Fish IBI= 48(fair), BM-IBI= 46(fair).
Basis for Assessment
[NOTE: Cedar Creek is classified as a "general use" waterbody upstream from its confluence with Little Cedar Creek. Thus, this reach of Cedar Creek was not assessed for either the 1996, 1998, or 2000 reports due to a lack of water quality information.]
[NOTE: For the 2002 report, the previous waterbody segment for Cedar Creek (IA 04-RAC-0160-0), which extended 28.23 miles from its confluence with Little Cedar Creek (Pocahontas Co.) to its headwaters in Pocahontas County, was split into two subsegments: (1) Little Cedar Creek to Drainage Ditch 21 (IA 04-RAC-0160-1) and (2) from Drainage Ditch 21 to headwaters in Pocahontas Co. (IA 04-RAC-0160-2).]
SUMMARY: The general aquatic life uses are assessed (evaluated) as "partially supported" based on results of IDNR/UHL biological (biocriteria) sampling in 2001. This is the same assessment as that developed for the 2002 reporting cycle. The assessment type is considered "evaluated" (relatively lower confidence assessment) due to the uncertainty of using biological assessment methods developed for Class B(LR) and wadable Class B(WW) streams for assessing aquatic life conditions in general use-only stream segments.
EXPLANATION: This assessment was based on data collected in September 2001 on Big Cedar Creek approximately 7 mile NNE of Fonda in Pocahontas County as part of the DNR/UHL stream biocriteria project. A series of biological metrics which reflect stream water quality and habitat integrity were calculated from the biocriteria sampling data. The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species that were collected in the stream sampling reach. The biological metrics were combined to make a fish community index of biotic integrity (F-IBI) and a benthic macroinvertebrate index (BM-IBI). The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum). The 2001 Fish IBI scores was 48(fair) and the BM-IBI scores was 46(fair). The aquatic life use support was assessed as partially supporting (=PS), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2002 Section 305(b) report. The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2001.
This assessment is considered “evaluated” (of lower confidence) due to the lack of a biological assessment protocol for general use-only streams. IDNR’s existing protocol has been calibrated to aquatic life reference conditions in wadeable Class B(LR) and Class B(WW) streams. The aquatic environment of most general use streams is one of extremes in water quality. Consequently, general use-only streams tend to have biological diversity that is low relative to more stable aquatic environments of Class B(LR) and Class B(WW) streams. Thus, the use of biological assessment methods developed for the ecologically more stable and diverse Class B(LR) streams to assess general use reaches will likely overstate the existence of impairment. For these reasons, general use-only stream reaches that show a failure to meet regional expectations for aquatic biota (fish or aquatic macroinvertebrates) of Class B(LR) streams, will not be added to Iowa’s Section 303(d) list of impaired waters (Category 5 of the Integrated Report). The assessment type for these waters will be considered "evaluated" (indicating an assessment with relatively lower confidence) as opposed to “monitored" (indicating an assessment with relatively high confidence). Such waters will be placed in either Category 2b or 3b of the IR and thus will be added to the state’s list of “waters in need of further investigation”.
