US Bridges

FM over Timber Creek

PoorPosted for load

Marshall County, Iowa · 083182102 · Structure no. 000000000242610

Built
1947
78 years old
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
2 main spans
Daily traffic
79
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Timber Creek is a steel stringer/multi-beam or girder carrying FM over Timber Creek in Marshall County, Iowa. It was built in 1947, so it is 78 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 load restriction.

It carries about 79 vehicles a day, projected to reach 79 by 2044. The structure is 70 ft (21.3 m) long and 21 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesTimber Creek
Location083182102
RouteCounty Highway 0
StateIowa
Coordinates41.98516, -92.9603
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating35.3 US tons
Inventory rating21.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length70 ft (21.3 m)
Longest span34 ft (10.4 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2022)
Projected traffic79 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Timber Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is FM over Timber 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 December 2024.

How much traffic does FM over Timber Creek carry?

About 79 vehicles per day (2022 count).

How long is FM over Timber Creek?

The structure is 70 ft (21.3 m) long with a longest span of 34 ft (10.4 m) and a deck 21 ft wide.

Who owns FM over Timber Creek?

It is owned by the County Highway Agency.