| Flood Impacts |
| 27.0 | Water reaches the Highway 14 road surface at the gage site. |
| 26.0 | Water reaches the top of the earthen levee alongside the river at the gage site. |
| 22.0 | Water reaches the underside of the steel I beams of the Highway 14 bridge. |
| 21.0 | A majority of Timmons Grove County Park is flooded. |
| 20.5 | Highway 330 south of Albion is closed. In Albion, parts of Marsh Avenue, Stanley Mill Road and 160th street flood. Highway 330 is threatened near the Linn Creek overpass which is located west of Marshalltown about 2 miles northeast of the Highway 30 junction. |
| 20.0 | Water approaches the top of the concrete bridge piers of the Highway 14 overpass at the gage site. |
| 19.4 | South bound lanes of Highway 14 begin to flood. Highway 330 south of Albion is flooded. |
| 19.0 | Highway 14 north of the gage site is threatened. |
| 18.5 | Water starts to flood Highway 330 south of Albion. |
| 18.0 | Significant flooding of land occurs alongside Highway 330 south of Albion as well as considerable agricultural flooding. |
| 17.0 | Roads within Timmons Grove County Park are threatened as is the bicycle path along 18th avenue in Marshalltown. |
| 16.5 | The underside of the primary concrete support span of Highway 14 is affected. |
| 16.0 | The access road serving north portions of Timmons Grove County Park is flooded. |
| 15.0 | Water approaches the bridge crossing from the County Three Bridges Road east of Marshalltown. Agricultural flooding begins. |
| 14.0 | There is lowland flooding north of town near the gage site. |
