US Bridges

FM Rohret RD over Drainage

Fair

Johnson County, Iowa · 079072303 · Structure no. 000000000204185

Built
1900
125 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
270
2021 count
Owner
County
County Highway Agency

About this bridge

FM Rohret RD over Drainage is a concrete continuous culvert carrying FM Rohret RD over Drainage in Johnson 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 270 vehicles a day, roughly 14% of them trucks, projected to reach 270 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFM Rohret RD
CrossesDrainage
Location079072303
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.63414, -91.62279
Functional classRural Minor 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 inspectionMay 2023
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 rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length27 ft (8.2 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 traffic270 (2021)
Projected traffic270 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM Rohret RD over Drainage built?

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

What condition is FM Rohret RD over Drainage 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 May 2023.

How much traffic does FM Rohret RD over Drainage carry?

About 270 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is FM Rohret RD over Drainage?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns FM Rohret RD over Drainage?

It is owned by the County Highway Agency.