US Bridges

FM over So Branch Salt Creek

Poor

Tama County, Iowa · 084133202 · Structure no. 000000000318730

Built
1969
56 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
363
2022 count
Owner
County
County Highway Agency

About this bridge

FM over So Branch Salt Creek is a concrete continuous slab carrying FM over So Branch Salt Creek in Tama County, Iowa. It was built in 1969, so it is 56 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 363 vehicles a day, roughly 13% of them trucks, projected to reach 363 by 2044. The structure is 129 ft (39.3 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesFM
CrossesSo Branch Salt Creek
Location084133202
RouteCounty Highway 0
StateIowa
Coordinates42.04748, -92.39579
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating33.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length129 ft (39.3 m)
Longest span49 ft (14.9 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic363 (2022)
Projected traffic363 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over So Branch Salt Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is FM over So Branch Salt Creek 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 September 2024.

How much traffic does FM over So Branch Salt Creek carry?

About 363 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is FM over So Branch Salt Creek?

The structure is 129 ft (39.3 m) long with a longest span of 49 ft (14.9 m) and a deck 30 ft wide.

Who owns FM over So Branch Salt Creek?

It is owned by the County Highway Agency.