US Bridges

Mo 171 S over Mna RR

Fair

Jasper County, Missouri · S 10 T 28 N R 32 W · Structure no. 2918

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
244 ft
5 main spans
Daily traffic
7,752
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 171 S over Mna RR is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 171 S over Mna RR in Jasper County, Missouri. It was built in 1978, so it is 47 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 7,752 vehicles a day, roughly 16% of them trucks, projected to reach 13,954 by 2044. The structure is 244 ft (74.4 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMo 171 S
CrossesMna RR
LocationS 10 T 28 N R 32 W
RouteState Highway 171
CountyJasper County
StateMissouri
Coordinates37.16516, -94.40071
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.3 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length244 ft (74.4 m)
Longest span67 ft (20.4 m)
Deck width39 ft (11.9 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,752 (2024)
Projected traffic13,954 by 2044
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 171 S over Mna RR built?

It was built in 1978, making it 47 years old in 2025.

What condition is Mo 171 S over Mna RR 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 August 2023.

How much traffic does Mo 171 S over Mna RR carry?

About 7,752 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is Mo 171 S over Mna RR?

The structure is 244 ft (74.4 m) long with a longest span of 67 ft (20.4 m) and a deck 39 ft wide.

Who owns Mo 171 S over Mna RR?

It is owned by the State Highway Agency.