US Bridges

Rt Mm S over Rock CR

Poor

Buchanan County, Missouri · S 32 T 56 N R 34 W · Structure no. 9788

Built
1948
77 years old
Condition
Poor
inspected November 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
420
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Mm S over Rock CR is a concrete continuous culvert carrying Rt Mm S over Rock CR in Buchanan County, Missouri. It was built in 1948, so it is 77 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 420 vehicles a day, roughly 11% of them trucks, projected to reach 546 by 2044. The structure is 22 ft (6.7 m) long and 26 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesRt Mm S
CrossesRock CR
LocationS 32 T 56 N R 34 W
RouteState Highway 0MM
CountyBuchanan County
StateMissouri
Coordinates39.6221, -94.74149
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 10
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic420 (2024)
Projected traffic546 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$306,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt Mm S over Rock CR built?

It was built in 1948, making it 77 years old in 2025.

What condition is Rt Mm S over Rock CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Rt Mm S over Rock CR carry?

About 420 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Rt Mm S over Rock CR?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns Rt Mm S over Rock CR?

It is owned by the State Highway Agency.