US Bridges

County RD 170 over Br of Prairie Fk

FairPosted for load

Callaway County, Missouri · S 16 T 47 N R 7 W · Structure no. 24492

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
72 ft
2 main spans
Daily traffic
25
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 170 over Br of Prairie Fk is a steel stringer/multi-beam or girder carrying County RD 170 over Br of Prairie Fk in Callaway County, Missouri. It was built in 1979, so it is 46 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 5% of them trucks, projected to reach 38 by 2043. The structure is 72 ft (21.9 m) long and 20 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesCounty RD 170
CrossesBr of Prairie Fk
LocationS 16 T 47 N R 7 W
RouteCounty Highway 500
CountyCallaway County
StateMissouri
Coordinates38.84956, -91.71431
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating32.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length72 ft (21.9 m)
Longest span35 ft (10.7 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic38 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 170 over Br of Prairie Fk built?

It was built in 1979, making it 46 years old in 2025.

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

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

About 25 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County RD 170 over Br of Prairie Fk?

The structure is 72 ft (21.9 m) long with a longest span of 35 ft (10.7 m) and a deck 20 ft wide.

Who owns County RD 170 over Br of Prairie Fk?

It is owned by the County Highway Agency.