US Bridges

Mo 185 S over Indian CR

Good

Washington County, Missouri · S 23 T 39 N R 1 W · Structure no. 549

Built
1961
64 years old, rebuilt 2009
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
260 ft
4 main spans
Daily traffic
509
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 185 S over Indian CR is a steel continuous stringer/multi-beam or girder carrying Mo 185 S over Indian CR in Washington County, Missouri. It was built in 1961 and reconstructed in 2009, so it is 64 years old, older 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 509 vehicles a day, roughly 12% of them trucks, projected to reach 713 by 2044. The structure is 260 ft (79.2 m) long and 31 ft wide. If it were closed, the detour would be 34.2 mi (55 km).

CarriesMo 185 S
CrossesIndian CR
LocationS 23 T 39 N R 1 W
RouteState Highway 185
Coordinates38.09058, -90.99283
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length260 ft (79.2 m)
Longest span72 ft (21.9 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic509 (2024)
Projected traffic713 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.2 mi (55 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Mo 185 S over Indian CR built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2009.

What condition is Mo 185 S over Indian CR 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 June 2024.

How much traffic does Mo 185 S over Indian CR carry?

About 509 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Mo 185 S over Indian CR?

The structure is 260 ft (79.2 m) long with a longest span of 72 ft (21.9 m) and a deck 31 ft wide.

Who owns Mo 185 S over Indian CR?

It is owned by the State Highway Agency.