Carter Lake IA 06-WEM-1714

Pottawattamie County S23T75NR44W at Carter Lake.

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

1994

Result Period

1990 - 1992

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 06-WEM-00265-L_0

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Fish Consumption

Not assessed

Primary Contact Recreation

Partial

Documentation

Assessment Comments

Monitored in 1992 by ISU as part of the Clean Lakes Classification study (1994); fish tissue monitored by Nebraska.

Basis for Assessment

Both fishable and swimmable uses were assessed as PS for the following reasons: (1) BPJ of DNR Fisheries; (2) results of monitoring show that average level of secchi depth (0.05 m) is one of the lowest average secchi depth of any SPOL sampled in 1990 and 1992 and is worse than the overall average of the 116 SPOLs sampled - 1 SD; the average level of chl-a was approx equal to the overall average and does not appear to explain the exceptionally low secchi depth; levels of total-P and TSS were better than the overall averages of the 116 SPOLs; (3) lake has a fishkill frequency (both winter & summer) of 10 percent. The watershed of Carter Lake is 100% urban; thus, impairments likely due contribution from urban NPSP. Relatively high levels of use for fishing reported by Bachmann et al. (1994) contradict assessment as PS.