Littlefield Lake IA 05-NSH-1439
Audubon County S17T78NR34W approx 4 mi SE of Exira.
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 05-NSH-00675-L_0
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Fish Consumption
Not assessed
Primary Contact Recreation
Partial
Documentation
Assessment Comments
Basis for Assessment
Both fishable and swimmable uses were assessed as PS for the 1994 report for the following reasons: (1) BPJ of DNR Fisheries; (2) resutls of monitoring show that the average level of secchi depth is worse than the overall average for the 86 SPO impoundments sampled in 1990 and 1992 and approaches 1 SD worse than the overall average; average levels of chl-a, total-P, and TSS are better than the overall averages; (3) Bachmann et al. report relatively low levels of fishing use and swimming use; (4) sedimentation rate (3.9 cm/yr) and life expectancy (62 years) are relatively poor for SPO impoundments and suggest impairment due to sediment delivered to the lake in ag NPSP.
Monitoring and Methods
Assessment Key Dates
Methods
| 340 | Primary producer surveys (phytoplankton/periphyton/macrophyton) |
| 120 | Surveys of fish and game biologists/other professionals |
| 222 | Non-fixed-station monitoring (conventional during key seasons and flows) |
Monitoring Levels
| Biological | 0 |
| Habitat | 0 |
| Physical Chemistry | 3 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 0 |
| BioIntegrity | N/A |