US Bridges

County RD 1137 over Flat CR

Fair

Monroe County, Missouri · S 3 T 54 N R 12 W · Structure no. 21078

Built
1986
39 years old
Condition
Fair
inspected May 2024
Type
Culvert
Steel
Length
36 ft
1 main span
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 1137 over Flat CR is a steel culvert carrying County RD 1137 over Flat CR in Monroe County, Missouri. It was built in 1986, so it is 39 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2043. The structure is 36 ft (11 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty RD 1137
CrossesFlat CR
LocationS 3 T 54 N R 12 W
RouteCounty Highway 288
CountyMonroe County
StateMissouri
Coordinates39.48858, -92.26714
Functional classRural Local

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating24.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadOther
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic44 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 County RD 1137 over Flat CR built?

It was built in 1986, making it 39 years old in 2025.

What condition is County RD 1137 over Flat CR 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 2024.

How much traffic does County RD 1137 over Flat CR carry?

About 35 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 1137 over Flat CR?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m).

Who owns County RD 1137 over Flat CR?

It is owned by the County Highway Agency.