US Bridges

County RD 166 over Harrison CR

Fair

Callaway County, Missouri · S 29 T 49 N R 8 W · Structure no. 23368

Built
1905
120 years old, rebuilt 1988
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
57 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 166 over Harrison CR is a steel stringer/multi-beam or girder carrying County RD 166 over Harrison CR in Callaway County, Missouri. It was built in 1905 and reconstructed in 1988, so it is 120 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 75 by 2043. The structure is 57 ft (17.4 m) long and 20 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesCounty RD 166
CrossesHarrison CR
LocationS 29 T 49 N R 8 W
RouteCounty Highway 406
CountyCallaway County
StateMissouri
Coordinates38.99242, -91.83747
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.7 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length57 ft (17.4 m)
Longest span57 ft (17.4 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-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 County RD 166 over Harrison CR built?

It was built in 1905, making it 120 years old in 2025. It was reconstructed in 1988.

What condition is County RD 166 over Harrison 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 October 2024.

How much traffic does County RD 166 over Harrison CR carry?

About 50 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County RD 166 over Harrison CR?

The structure is 57 ft (17.4 m) long with a longest span of 57 ft (17.4 m) and a deck 20 ft wide.

Who owns County RD 166 over Harrison CR?

It is owned by the County Highway Agency.