US Bridges

County RD 308 over S Fk Salt Rvr

Good

Audrain County, Missouri · S 23 T 51 N R 9 W · Structure no. 29257

Built
2003
22 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
232 ft
4 main spans
Daily traffic
1,350
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 308 over S Fk Salt Rvr is a prestressed concrete continuous stringer/multi-beam or girder carrying County RD 308 over S Fk Salt Rvr in Audrain County, Missouri. It was built in 2003, so it is 22 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,350 vehicles a day, roughly 25% of them trucks, projected to reach 1,688 by 2043. The structure is 232 ft (70.7 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty RD 308
CrossesS Fk Salt Rvr
LocationS 23 T 51 N R 9 W
RouteCounty Highway 669
CountyAudrain County
StateMissouri
Coordinates39.1899, -91.87592
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans4
Design loadHS 20 + Mod
Structure length232 ft (70.7 m)
Longest span70 ft (21.3 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2023)
Projected traffic1,688 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 308 over S Fk Salt Rvr built?

It was built in 2003, making it 22 years old in 2025.

What condition is County RD 308 over S Fk Salt Rvr in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does County RD 308 over S Fk Salt Rvr carry?

About 1,350 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is County RD 308 over S Fk Salt Rvr?

The structure is 232 ft (70.7 m) long with a longest span of 70 ft (21.3 m) and a deck 37 ft wide.

Who owns County RD 308 over S Fk Salt Rvr?

It is owned by the County Highway Agency.