East Big Creek IA 02-CED-503
mouth (S30 T84N R5W Linn Co.) to Hwy 151 crossing in S27 T84N R5W Linn Co.
Assessment Comments
1996 DNR Fisheries survey and occurance of 1998 fish kill.
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses were assessed as "partially supported." EXPLANATION: The assessment of the Class B(LR) aquatic life uses developed for the 1998 report ("fully supported / threatened"; see above) was based on results of fish surveys conducted by the DNR Water Quality Bureau and DNR Fisheries Bureau in 1991 and 1996, respectively. A fish kill, however, occurred in East Big Creek on April 23, 1997; this kill was caused by high levels of ammonia from a quarrying operation (see assessment for the 1998 report above). According to DNR's revised assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill within the most recent three-year period (1997-1999) indicates that the aquatic life uses of a waterbody are only "partially supported." Thus, the assessment of support of theClass B(LR) aquatic life uses was changed from "fully supported / threatened" to "partially supported."
Assessment Key Dates
| 4/23/1997 | Fishkill |
| 7/1/1996 | Biological Monitoring |
Methods
| 330 | Fish surveys |
| 140 | Incidence of spills and/or fish kills |
Monitoring Levels
| Biological | 3 |
| Habitat | 0 |
| Physical Chemistry | 0 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 0 |
| BioIntegrity | N/A |