US Bridges

FM over Linn Creek

Poor

Marshall County, Iowa · 083190212 · Structure no. 000000000242730

Built
1963
62 years old
Condition
Poor
inspected November 2024
Type
Slab
Concrete Continuous
Length
72 ft
3 main spans
Daily traffic
216
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Linn Creek is a concrete continuous slab carrying FM over Linn Creek in Marshall County, Iowa. It was built in 1963, so it is 62 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.

It carries about 216 vehicles a day, projected to reach 216 by 2044. The structure is 72 ft (21.9 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFM
CrossesLinn Creek
Location083190212
RouteCounty Highway 0
CountyMarshall County
StateIowa
Coordinates42.02727, -93.03879
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.5 US tons
Inventory rating28.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length72 ft (21.9 m)
Longest span27 ft (8.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (2022)
Projected traffic216 by 2044
Trucks0%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Linn Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is FM over Linn 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 November 2024.

How much traffic does FM over Linn Creek carry?

About 216 vehicles per day (2022 count).

How long is FM over Linn Creek?

The structure is 72 ft (21.9 m) long with a longest span of 27 ft (8.2 m) and a deck 31 ft wide.

Who owns FM over Linn Creek?

It is owned by the County Highway Agency.