US Bridges

Rt Ad S over Gasconade Rvr

Poor

Laclede County, Missouri · S 28 T 33 N R 13 W · Structure no. 8472

Built
1965
60 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
533 ft
4 main spans
Daily traffic
119
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Ad S over Gasconade Rvr is a steel continuous stringer/multi-beam or girder carrying Rt Ad S over Gasconade Rvr in Laclede County, Missouri. It was built in 1965, so it is 60 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 119 vehicles a day, roughly 20% of them trucks, projected to reach 179 by 2044. The structure is 533 ft (162.5 m) long and 29 ft wide. If it were closed, the detour would be 18 mi (29 km).

CarriesRt Ad S
CrossesGasconade Rvr
LocationS 28 T 33 N R 13 W
RouteState Highway 0AD
Coordinates37.53521, -92.37231
Functional classRural Minor 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating34.7 US tons
Inventory rating20.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length533 ft (162.5 m)
Longest span150 ft (45.7 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic119 (2024)
Projected traffic179 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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$3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt Ad S over Gasconade Rvr built?

It was built in 1965, making it 60 years old in 2025.

What condition is Rt Ad S over Gasconade Rvr 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 October 2024.

How much traffic does Rt Ad S over Gasconade Rvr carry?

About 119 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Rt Ad S over Gasconade Rvr?

The structure is 533 ft (162.5 m) long with a longest span of 150 ft (45.7 m) and a deck 29 ft wide.

Who owns Rt Ad S over Gasconade Rvr?

It is owned by the State Highway Agency.