US Bridges

Mo 73 S over Tunas Br

Fair

Dallas County, Missouri · S 21 T 36 N R 19 W · Structure no. 4791

Built
1925
100 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
45 ft
2 main spans
Daily traffic
2,022
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 73 S over Tunas Br is a concrete slab carrying Mo 73 S over Tunas Br in Dallas County, Missouri. It was built in 1925, so it is 100 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.

It carries about 2,022 vehicles a day, roughly 11% of them trucks, projected to reach 3,336 by 2044. The structure is 45 ft (13.7 m) long and 23 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesMo 73 S
CrossesTunas Br
LocationS 21 T 36 N R 19 W
RouteState Highway 73
CountyDallas County
StateMissouri
Coordinates37.84656, -93.03019
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionOctober 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating24.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length45 ft (13.7 m)
Longest span21 ft (6.3 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,022 (2024)
Projected traffic3,336 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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$431,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 73 S over Tunas Br built?

It was built in 1925, making it 100 years old in 2025.

What condition is Mo 73 S over Tunas Br 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 2023.

How much traffic does Mo 73 S over Tunas Br carry?

About 2,022 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Mo 73 S over Tunas Br?

The structure is 45 ft (13.7 m) long with a longest span of 21 ft (6.3 m) and a deck 23 ft wide.

Who owns Mo 73 S over Tunas Br?

It is owned by the State Highway Agency.