US Bridges

Monkeyrun TR 071 over Marble CR

PoorPosted for load

Ralls County, Missouri · S 2 T 56 N R 4 W · Structure no. 14589

Built
1900
125 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Concrete
Length
47 ft
2 main spans
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

Monkeyrun TR 071 over Marble CR is a concrete tee beam carrying Monkeyrun TR 071 over Marble CR in Ralls County, Missouri. It was built in 1900, so it is 125 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. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, roughly 10% of them trucks, projected to reach 250 by 2043. The structure is 47 ft (14.3 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMonkeyrun TR 071
CrossesMarble CR
LocationS 2 T 56 N R 4 W
RouteCounty Highway 71
Coordinates39.67314, -91.30633
Functional classRural Local

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating33.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length47 ft (14.3 m)
Longest span24 ft (7.2 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic250 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$383,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Monkeyrun TR 071 over Marble CR built?

It was built in 1900, making it 125 years old in 2025.

What condition is Monkeyrun TR 071 over Marble 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 June 2024.

How much traffic does Monkeyrun TR 071 over Marble CR carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Monkeyrun TR 071 over Marble CR?

The structure is 47 ft (14.3 m) long with a longest span of 24 ft (7.2 m) and a deck 24 ft wide.

Who owns Monkeyrun TR 071 over Marble CR?

It is owned by the County Highway Agency.