US Bridges

County RD 8690 over Mustin CR

Fair

Howell County, Missouri · S 35 T 24 N R 8 W · Structure no. 24837

Built
1922
103 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 8690 over Mustin CR is a concrete continuous slab carrying County RD 8690 over Mustin CR in Howell County, Missouri. It was built in 1922, so it is 103 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 130 by 2043. The structure is 77 ft (23.5 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty RD 8690
CrossesMustin CR
LocationS 35 T 24 N R 8 W
RouteCounty Highway 562
CountyHowell County
StateMissouri
Coordinates36.7064, -91.8193
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 10
Structure length77 ft (23.5 m)
Longest span26 ft (7.9 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic130 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$396,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 8690 over Mustin CR built?

It was built in 1922, making it 103 years old in 2025.

What condition is County RD 8690 over Mustin 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 November 2024.

How much traffic does County RD 8690 over Mustin CR carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 8690 over Mustin CR?

The structure is 77 ft (23.5 m) long with a longest span of 26 ft (7.9 m) and a deck 21 ft wide.

Who owns County RD 8690 over Mustin CR?

It is owned by the County Highway Agency.