Neosho River at Iola, KS
River level and flood forecast · Allen County
Normal8.9 ftas of Mon 3:30 PM
The river is 6.1 ft below flood stage (15 ft).
Forecast to hold near 8.9 ft through Sat, Oct 17, 7 AM.
Flow: 4,210 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 8:07 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 27 ft |
| Moderate flood stage | 21 ft |
| Flood stage | 15 ft |
| Action stage | 13 ft |
| Record crest (July 13, 1951) | 33.26 ft |
What floods at each level
From the National Weather Service, highest first.
- 33 ftExpect one third of the city of Iola to be inundated by 3 feet of flood waters.
- 27 ftThe base of the Iola Water Power Plant begins to take on water. Expect flooding of some streets in Iola.
- 21 ftFlood waters reach the Cabins on west bank of river.
- 19.5 ftFlood waters flow over 1300 Street, just north of Elm Creek, and over low lying fields next to the Water Plant. Expect west bank overflows north of gage site.
- 19 ftThe gravel road below the low water dam on west side of river floods as well as agricultural fields.
- 17 ftFlood waters cover West Bruner Street by Riverside Park.
- 15 ftFlooding occurs for about 1.5 miles over Dry Lake Corner on 1000 Street north of Highway 54.
Highest crests on record
- 33.26 ft — July 13, 1951
- 26.9 ft — July 1, 2007
- 23.5 ft — September 13, 1926
- 22.65 ft — April 25, 1944
- 22.4 ft — April 18, 1945
Recent crests: 14.38 ft (June 26, 2026) · 14.59 ft (June 10, 2026) · 13.04 ft (June 18, 2025) · 18.69 ft (June 4, 2025) · 15.63 ft (June 10, 2024)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (IOLK1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.