US Bridges

County RD 277 over Mill CR

Fair

Oregon County, Missouri · S 6 T 21 N R 2 W · Structure no. 32473

Built
2008
17 years old
Condition
Fair
inspected January 2024
Type
Culvert
Steel Continuous
Length
29 ft
6 main spans
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 277 over Mill CR is a steel continuous culvert carrying County RD 277 over Mill CR in Oregon County, Missouri. It was built in 2008, so it is 17 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 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 120 by 2044. The structure is 29 ft (8.8 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty RD 277
CrossesMill CR
LocationS 6 T 21 N R 2 W
RouteCounty Highway 146
CountyOregon County
StateMissouri
Coordinates36.50053, -91.21869
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span3 ft (0.9 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic120 by 2044
Trucks10%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 277 over Mill CR built?

It was built in 2008, making it 17 years old in 2025.

What condition is County RD 277 over Mill 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 January 2024.

How much traffic does County RD 277 over Mill CR carry?

About 100 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 277 over Mill CR?

The structure is 29 ft (8.8 m) long with a longest span of 3 ft (0.9 m) and a deck 24 ft wide.

Who owns County RD 277 over Mill CR?

It is owned by the County Highway Agency.