US Bridges

180th ST/E29 over Richland 81 Open Ditch

Fair

Story County, Iowa · 084222201 · Structure no. 000000000315161

Built
2009
16 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,028
2022 count
Owner
County
County Highway Agency

About this bridge

180th ST/E29 over Richland 81 Open Ditch is a concrete continuous culvert carrying 180th ST/E29 over Richland 81 Open Ditch in Story County, Iowa. It was built in 2009, so it is 16 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 1,028 vehicles a day, roughly 20% of them trucks, projected to reach 1,028 by 2043. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
Carries180th ST/E29
CrossesRichland 81 Open Ditch
Location084222201
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.07794, -93.38936
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
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 alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 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 traffic1,028 (2022)
Projected traffic1,028 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 180th ST/E29 over Richland 81 Open Ditch built?

It was built in 2009, making it 16 years old in 2025.

What condition is 180th ST/E29 over Richland 81 Open Ditch 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 2022.

How much traffic does 180th ST/E29 over Richland 81 Open Ditch carry?

About 1,028 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is 180th ST/E29 over Richland 81 Open Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns 180th ST/E29 over Richland 81 Open Ditch?

It is owned by the County Highway Agency.