US Bridges

FM over Spring Branch

Good

Carroll County, Iowa · 083341602 · Structure no. 000000000094281

Built
1997
28 years old
Condition
Good
inspected March 2024
Type
Slab
Concrete Continuous
Length
91 ft
3 main spans
Daily traffic
1,186
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Spring Branch is a concrete continuous slab carrying FM over Spring Branch in Carroll County, Iowa. It was built in 1997, so it is 28 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,186 vehicles a day, roughly 16% of them trucks, projected to reach 1,186 by 2044. The structure is 91 ft (27.7 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFM
CrossesSpring Branch
Location083341602
RouteCounty Highway 0
StateIowa
Coordinates42.00154, -94.82212
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.7 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span34 ft (10.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,186 (2022)
Projected traffic1,186 by 2044
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Spring Branch built?

It was built in 1997, making it 28 years old in 2025.

What condition is FM over Spring Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.

How much traffic does FM over Spring Branch carry?

About 1,186 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is FM over Spring Branch?

The structure is 91 ft (27.7 m) long with a longest span of 34 ft (10.4 m) and a deck 33 ft wide.

Who owns FM over Spring Branch?

It is owned by the County Highway Agency.