Iowa River at Marshalltown, IA
River level and flood forecast · Marshall County
Normal13.0 ftas of Mon 2 PM
The river is 6.0 ft below flood stage (19 ft).
Flow: 2,190 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Thu, Oct 8, 2:58 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 26 ft |
| Moderate flood stage | 23 ft |
| Flood stage | 19 ft |
| Action stage | 14 ft |
| Record crest (July 2, 2014) | 22.25 ft |
What floods at each level
From the National Weather Service, highest first.
- 26 ftWater reaches the top of the earthen levee along the river at Iowa 14.
- 22 ftWater reaches the low beams of the Iowa 14 bridge.
- 21.5 ftWater affects several roads east of Marshalltown...including US 30...E Main St Rd and Zeller Ave.
- 21.4 ftWater affects both lanes of Iowa 14 north of Marshalltown.
- 21.2 ftWater affects several gravel roads north and northwest of Marshalltown...including Stanley Mill Rd...N Center St...Oaks Ave and Prairie Ave.
- 21 ftIowa 330 south of Albion near Timmons Grove Park is closed. Water affects most of Timmons Grove County Park.
- 20.5 ftIn Albion...water affects parts of Marsh Ave...Stanley Mill Rd and 160th St. Water threatens Iowa 330 near the Linn Creek overpass which is located west of Marshalltown...or about two miles northeast of the US 30 junction.
- 20 ftWater approaches the top of the concrete bridge piers of the Iowa 14 bridge.
- 19.5 ftWater affects the southbound lanes of Iowa 14 as well as Iowa 330 south of Albion.
- 19 ftWater affects Iowa 14 north of the river as well as Iowa 330 south of Albion.
- 18 ftWidespread agricultural and lowland flooding occur along Iowa 330 south of Albion.
- 17 ftWater threatens roads within Timmons Grove County Park as well as the bicycle path along 18th Ave in Marshalltown.
- 16.5 ftWater affects the underside of the primary concrete support span of Iowa 14.
- 16 ftWater affects the access road serving north portions of Timmons Grove County Park.
- 15 ftWater approaches the bridge crossing from the County Three Bridges Rd east of Marshalltown. Water affects agricultural land.
- 14 ftLowland flooding occurs north of town near Iowa 14.
Highest crests on record
- 22.25 ft — July 2, 2014
- 22.08 ft — May 30, 2013
- 21.79 ft — June 13, 2008
- 20.77 ft — August 17, 1993
- 20.38 ft — June 18, 1990
Recent crests: 18.67 ft (July 31, 2025) · 20 ft (May 23, 2024) · 17.71 ft (February 28, 2023) · 16.64 ft (June 16, 2022) · 13.22 ft (March 7, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MIWI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.