US Bridges

Ia 76 over Mineral Creek

Fair

Allamakee County, Iowa · 1.6 Mi. S of Jct. SR A26 · Structure no. 000000000013650

Built
1929
96 years old, rebuilt 1955
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
980
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 76 over Mineral Creek is a steel stringer/multi-beam or girder carrying Ia 76 over Mineral Creek in Allamakee County, Iowa. It was built in 1929 and reconstructed in 1955, so it is 96 years old, older 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 980 vehicles a day, roughly 27% of them trucks, projected to reach 980 by 2044. The structure is 54 ft (16.4 m) long and 32 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesIa 76
CrossesMineral Creek
Location1.6 Mi. S of Jct. SR A26
RouteState Highway 76
CountyAllamakee County
StateIowa
Coordinates43.4064, -91.51105
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating40.3 US tons
Inventory rating24.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length54 ft (16.4 m)
Longest span50 ft (15.2 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic980 (2022)
Projected traffic980 by 2044
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 76 over Mineral Creek built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1955.

What condition is Ia 76 over Mineral Creek 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 2024.

How much traffic does Ia 76 over Mineral Creek carry?

About 980 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is Ia 76 over Mineral Creek?

The structure is 54 ft (16.4 m) long with a longest span of 50 ft (15.2 m) and a deck 32 ft wide.

Who owns Ia 76 over Mineral Creek?

It is owned by the State Highway Agency.