Odebolt Creek IA 06-LSR-1592

Assessment Comments

Assessment is based on results of IDNR/UHL biological (biocriteria) sampling in 1997 (dstr->upstr): Fish IBI= 39(fair), 35(fair); BM-IBI= 57(good), 57(good).

Basis for Assessment

SUMMARY:  The Class B(LR) aquatic life uses are assessed (monitored) as "fully supported / threatened" (minor impacts) based on results of IDNR/UHL biological (biocriteria) sampling in 1997.   This is the same assessment as that developed for the 2002 reporting cycle.

EXPLANATION:  The aquatic life uses remain assessed as "fully supported / threatened" based on results of the IDNR/UHL biocriteria monitoring conducted on this stream segment in 1997.   Sampling was conducted at two sites on this stream segment.   The F-IBI scores were 39 and 35 (both in the "fair" category); the BM-IBI scores were 57 at both sites (good).   The aquatic life use support was assessed as fully supported / threatened (=FST), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2000 Section 305(b) report.   The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-1998.    See the assessment developed for the 2000 reporting cycle for more information.   These data are less than five years old and, according to IDNR's methodology for Section 305(b) assessments, are thus appropriate for characterizing current water quality conditions.