US Bridges

FM over Dd #65

Fair

Calhoun County, Iowa · 088321802 · Structure no. 000000000362271

Built
1987
38 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
957
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Dd #65 is a prestressed concrete stringer/multi-beam or girder carrying FM over Dd #65 in Calhoun County, Iowa. It was built in 1987, so it is 38 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 957 vehicles a day, roughly 9% of them trucks, projected to reach 957 by 2043. The structure is 55 ft (16.8 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFM
CrossesDd #65
Location088321802
RouteCounty Highway 0
StateIowa
Coordinates42.43026, -94.63027
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length55 ft (16.8 m)
Longest span53 ft (16.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic957 (2022)
Projected traffic957 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$136,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Dd #65 built?

It was built in 1987, making it 38 years old in 2025.

What condition is FM over Dd #65 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does FM over Dd #65 carry?

About 957 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is FM over Dd #65?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.2 m) and a deck 32 ft wide.

Who owns FM over Dd #65?

It is owned by the County Highway Agency.