US Bridges

FM & 296th ST over Harris Grove Creek

Fair

Harrison County, Iowa · 078431105 · Structure no. 000000000177580

Built
1900
125 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
379
2022 count
Owner
County
County Highway Agency

About this bridge

FM & 296th ST over Harris Grove Creek is a concrete continuous culvert carrying FM & 296th ST over Harris Grove Creek in Harrison County, Iowa. It was built in 1900, so it is 125 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 379 vehicles a day, roughly 20% of them trucks, projected to reach 379 by 2044. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesFM & 296th ST
CrossesHarris Grove Creek
Location078431105
RouteCounty Highway 0
CountyHarrison County
StateIowa
Coordinates41.57858, -95.75902
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic379 (2022)
Projected traffic379 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM & 296th ST over Harris Grove Creek built?

It was built in 1900, making it 125 years old in 2025.

What condition is FM & 296th ST over Harris Grove 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 December 2024.

How much traffic does FM & 296th ST over Harris Grove Creek carry?

About 379 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is FM & 296th ST over Harris Grove Creek?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.7 m).

Who owns FM & 296th ST over Harris Grove Creek?

It is owned by the County Highway Agency.