US Bridges

Allen ST over Turkey Creek

Good

Cass County, Iowa · H60000500 · Structure no. 000000000012761

Built
1994
31 years old
Condition
Good
inspected March 2024
Type
Slab
Concrete Continuous
Length
115 ft
3 main spans
Daily traffic
23
2022 count
Owner
County
County Highway Agency

About this bridge

Allen ST over Turkey Creek is a concrete continuous slab carrying Allen ST over Turkey Creek in Cass County, Iowa. It was built in 1994, so it is 31 years old, younger 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 23 vehicles a day, roughly 26% of them trucks, projected to reach 23 by 2044. The structure is 115 ft (35.1 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesAllen ST
CrossesTurkey Creek
LocationH60000500
RouteCity Street 0
StateIowa
Coordinates41.3979, -94.88677
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating91.8 US tons
Inventory rating54.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span44 ft (13.4 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23 (2022)
Projected traffic23 by 2044
Trucks26%
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 byOther State Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Allen ST over Turkey Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Allen ST over Turkey 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 March 2024.

How much traffic does Allen ST over Turkey Creek carry?

About 23 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is Allen ST over Turkey Creek?

The structure is 115 ft (35.1 m) long with a longest span of 44 ft (13.4 m) and a deck 27 ft wide.

Who owns Allen ST over Turkey Creek?

It is owned by the County Highway Agency and maintained by the Other State Agency.