US Bridges

Ia 127 over Allen Creek

Good

Harrison County, Iowa · 8.5 Mi. W of US 30 · Structure no. 000000000027730

Built
1968
57 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
184 ft
3 main spans
Daily traffic
460
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 127 over Allen Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 127 over Allen Creek in Harrison County, Iowa. It was built in 1968, so it is 57 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 460 vehicles a day, roughly 19% of them trucks, projected to reach 460 by 2043. The structure is 184 ft (56.1 m) long and 35 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIa 127
CrossesAllen Creek
Location8.5 Mi. W of US 30
RouteState Highway 127
CountyHarrison County
StateIowa
Coordinates41.69669, -95.91221
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length184 ft (56.1 m)
Longest span61 ft (18.6 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic460 (2022)
Projected traffic460 by 2043
Trucks19%
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

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 127 over Allen Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Ia 127 over Allen Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Ia 127 over Allen Creek carry?

About 460 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 127 over Allen Creek?

The structure is 184 ft (56.1 m) long with a longest span of 61 ft (18.6 m) and a deck 35 ft wide.

Who owns Ia 127 over Allen Creek?

It is owned by the State Highway Agency.