Little Sioux River IA 06-LSR-1571

Assessment Comments

Assessment is based on results of U.S. EPA / IDNR fish tissue (RAFT) monitoring near Linn Grove in 2001.

Basis for Assessment

[Note:  For the 2002 report, the previous waterbody segment for the Little Sioux River (IA 06-LSR-0030-1), which extended 38 miles from the Highway 3 at Cherokee (Cherokee Co.) (approximately equal to confluence with Mill Creek north of Cherokee) to the Linn Grove Dam (Buena Vista Co.), was split into two subsegments:  (1) Highway 3 at Cherokee to confluence with Waterman Creek (O'Brien Co.) (IA 06-LSR-0030-1) and (2) Waterman Creek to the Linn Grove Dam (Buena Vista Co.) (IA 06-LSR-0030-2 - this one).   See previous Section 305(b) assessments for IA 06-LSR-0030_1
for the assessments of the original 38-mile river reach.]

For the 2002 report:  SUMMARY:  The Class B(WW) aquatic life uses remain "not assessed."  Fish consumption uses are assessed as "fully supported."  This assessment is based on results of U.S.  EPA / IDNR fish tissue (RAFT) monitoring in 2001 downstream from the Linn Grove dam.   This assessment was also used for the adjacent upstream segment of the Little Sioux River (IA 06-LSR-0030-3).  EXPLANATION:  The Class B(WW) uses remain "not assessed" due to the lack of relevant water quality information for this segment.   Fish consumption uses are assessed as "fully supported" based on results of EPA/DNR fish tissue (RAFT) monitoring in August 2001 downstream from the Linn Grove Dam.   Results of this monitoring show that levels of all contaminants in the composite samples of fillets of channel catfish and walleye were far below ½ of the respective FDA action levels and IDNR levels of concern.