US Bridges

Calvert Hill RD over Rocky Fk CR

FairPosted for load

Boone County, Missouri · S 12 T 49 N R 12 W · Structure no. 17193

Built
1970
55 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
2 main spans
Daily traffic
686
2023 count
Owner
County
County Highway Agency

About this bridge

Calvert Hill RD over Rocky Fk CR is a steel stringer/multi-beam or girder carrying Calvert Hill RD over Rocky Fk CR in Boone County, Missouri. It was built in 1970, so it is 55 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 5 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 686 vehicles a day, roughly 3% of them trucks, projected to reach 1,303 by 2043. The structure is 82 ft (25 m) long and 21 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCalvert Hill RD
CrossesRocky Fk CR
LocationS 12 T 49 N R 12 W
RouteCounty Highway 145
CountyBoone County
StateMissouri
Coordinates39.054, -92.32546
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.7 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length82 ft (25 m)
Longest span46 ft (14 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic686 (2023)
Projected traffic1,303 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$628,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Calvert Hill RD over Rocky Fk CR built?

It was built in 1970, making it 55 years old in 2025.

What condition is Calvert Hill RD over Rocky Fk 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 December 2024.

How much traffic does Calvert Hill RD over Rocky Fk CR carry?

About 686 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Calvert Hill RD over Rocky Fk CR?

The structure is 82 ft (25 m) long with a longest span of 46 ft (14 m) and a deck 21 ft wide.

Who owns Calvert Hill RD over Rocky Fk CR?

It is owned by the County Highway Agency.