US Bridges

County RD 170 over Prairie Fork Br

GoodPosted for load

Callaway County, Missouri · S 11 T 47 N R 7 W · Structure no. 24494

Built
1966
59 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
87 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 170 over Prairie Fork Br is a steel stringer/multi-beam or girder carrying County RD 170 over Prairie Fork Br in Callaway County, Missouri. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, roughly 5% of them trucks, projected to reach 45 by 2043. The structure is 87 ft (26.5 m) long and 24 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesCounty RD 170
CrossesPrairie Fork Br
LocationS 11 T 47 N R 7 W
RouteCounty Highway 500
CountyCallaway County
StateMissouri
Coordinates38.86434, -91.66463
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating10.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length87 ft (26.5 m)
Longest span79 ft (24.1 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$445,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 170 over Prairie Fork Br built?

It was built in 1966, making it 59 years old in 2025.

What condition is County RD 170 over Prairie Fork Br 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 October 2024.

How much traffic does County RD 170 over Prairie Fork Br carry?

About 30 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County RD 170 over Prairie Fork Br?

The structure is 87 ft (26.5 m) long with a longest span of 79 ft (24.1 m) and a deck 24 ft wide.

Who owns County RD 170 over Prairie Fork Br?

It is owned by the County Highway Agency.