US Bridges

FM over Dd #81

Fair

Palo Alto County, Iowa · 096333506 · Structure no. 000000000270011

Built
1991
34 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
247 ft
3 main spans
Daily traffic
244
2021 count
Owner
County
County Highway Agency

About this bridge

FM over Dd #81 is a prestressed concrete stringer/multi-beam or girder carrying FM over Dd #81 in Palo Alto County, Iowa. It was built in 1991, so it is 34 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 6 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 244 vehicles a day, roughly 17% of them trucks, projected to reach 244 by 2043. The structure is 247 ft (75.3 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM
CrossesDd #81
Location096333506
RouteCounty Highway 0
CountyPalo Alto County
StateIowa
Coordinates43.0872, -94.70837
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 48 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length247 ft (75.3 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic244 (2021)
Projected traffic244 by 2043
Trucks17%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Dd #81 built?

It was built in 1991, making it 34 years old in 2025.

What condition is FM over Dd #81 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 April 2023.

How much traffic does FM over Dd #81 carry?

About 244 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is FM over Dd #81?

The structure is 247 ft (75.3 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns FM over Dd #81?

It is owned by the County Highway Agency.