US Bridges

FM over Big Cedar Creek

PoorPosted for load

Jefferson County, Iowa · 071100305 · Structure no. 000000000200270

Built
1956
69 years old, rebuilt 1976
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
254 ft
3 main spans
Daily traffic
1,050
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Big Cedar Creek is a concrete continuous stringer/multi-beam or girder carrying FM over Big Cedar Creek in Jefferson County, Iowa. It was built in 1956 and reconstructed in 1976, so it is 69 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 3 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. Its operating status is: posted for other load-capacity restriction.

It carries about 1,050 vehicles a day, roughly 12% of them trucks, projected to reach 1,050 by 2044. The structure is 254 ft (77.4 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesFM
CrossesBig Cedar Creek
Location071100305
RouteCounty Highway 0
StateIowa
Coordinates40.97824, -91.99802
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 12 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating34.5 US tons
Inventory rating0 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length254 ft (77.4 m)
Longest span100 ft (30.5 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,050 (2022)
Projected traffic1,050 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Big Cedar Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1976.

What condition is FM over Big Cedar 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 February 2024.

How much traffic does FM over Big Cedar Creek carry?

About 1,050 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is FM over Big Cedar Creek?

The structure is 254 ft (77.4 m) long with a longest span of 100 ft (30.5 m) and a deck 32 ft wide.

Who owns FM over Big Cedar Creek?

It is owned by the County Highway Agency.