US Bridges

W 170 ST over Lit Rock CR

FairPosted for load

Harrison County, Missouri · S 31 T 66 N R 29 W · Structure no. 16996

Built
1963
62 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
25
2024 count
Owner
County
County Highway Agency

About this bridge

W 170 ST over Lit Rock CR is a steel stringer/multi-beam or girder carrying W 170 ST over Lit Rock CR in Harrison County, Missouri. It was built in 1963, so it is 62 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. Its operating status is: posted for load restriction.

It carries about 25 vehicles a day, roughly 10% of them trucks, projected to reach 29 by 2044. The structure is 30 ft (9.1 m) long and 14 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesW 170 ST
CrossesLit Rock CR
LocationS 31 T 66 N R 29 W
RouteCounty Highway 139
CountyHarrison County
StateMissouri
Coordinates40.47044, -94.21588
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
Deck7 GoodSome minor problems.
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.8 US tons
Inventory rating15.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 10
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic29 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 W 170 ST over Lit Rock CR built?

It was built in 1963, making it 62 years old in 2025.

What condition is W 170 ST over Lit Rock 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 March 2024.

How much traffic does W 170 ST over Lit Rock CR carry?

About 25 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is W 170 ST over Lit Rock CR?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 14 ft wide.

Who owns W 170 ST over Lit Rock CR?

It is owned by the County Highway Agency.