Monona-Harrison Ditch near Turin
Monona County, Iowa
The past week
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What floods at each level
- 29.5 ft
Water reaches the bottom of the bridge at the gage site.
- 28 ft
Widespread flooding of agricultural community would occur across the entire basin in which the Monona-Harrison Ditch as well as the Little Sioux River run. Both water channels run parallel with one another across most of Monona County and the northwest corner of Harrison County before joining the Missouri River.
- 25 ft
Water overtops the levee system causing flooding of only surrounding agricultural fields and may overrun part of County HWY E54.
- 23 ft
Water overtops the natural banks indicative of minor flooding but remains within the levee.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Feb 18, 1971 | 28.03 ft | 19,900 cfs |
| Mar 14, 2019 | 26.12 ft | 14,500 cfs |
| Jun 17, 1984 | 24.8 ft | 13,300 cfs |
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