US Bridges

FM over Over-Flow-North River

Poor

Madison County, Iowa · 077263102 · Structure no. 000000000234640

Built
1970
55 years old
Condition
Poor
inspected August 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
880
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Over-Flow-North River is a concrete continuous slab carrying FM over Over-Flow-North River in Madison County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 880 vehicles a day, roughly 6% of them trucks, projected to reach 880 by 2043. The structure is 78 ft (23.8 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFM
CrossesOver-Flow-North River
Location077263102
RouteCounty Highway 0
CountyMadison County
StateIowa
Coordinates41.42719, -93.89714
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.9 US tons
Inventory rating29.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic880 (2022)
Projected traffic880 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$642,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Over-Flow-North River built?

It was built in 1970, making it 55 years old in 2025.

What condition is FM over Over-Flow-North River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does FM over Over-Flow-North River carry?

About 880 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is FM over Over-Flow-North River?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns FM over Over-Flow-North River?

It is owned by the County Highway Agency.