US Bridges

County RD NW 1270 over Trib of Coopers CR

Fair

St. Clair County, Missouri · S 4 T 39 N R 26 W · Structure no. 15480

Built
1950
75 years old, rebuilt 1992
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 1270 over Trib of Coopers CR is a steel stringer/multi-beam or girder carrying County RD NW 1270 over Trib of Coopers CR in St. Clair County, Missouri. It was built in 1950 and reconstructed in 1992, so it is 75 years old, older 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 48 by 2043. The structure is 32 ft (9.8 m) long and 18 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty RD NW 1270
CrossesTrib of Coopers CR
LocationS 4 T 39 N R 26 W
RouteCounty Highway 95
CountySt. Clair County
StateMissouri
Coordinates38.20673, -93.78409
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating46.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length32 ft (9.8 m)
Longest span29 ft (8.8 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic48 by 2043
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 byOther Local 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 NW 1270 over Trib of Coopers CR built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1992.

What condition is County RD NW 1270 over Trib of Coopers 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 December 2023.

How much traffic does County RD NW 1270 over Trib of Coopers CR carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD NW 1270 over Trib of Coopers CR?

The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.8 m) and a deck 18 ft wide.

Who owns County RD NW 1270 over Trib of Coopers CR?

It is owned by the County Highway Agency and maintained by the Other Local Agency.