US Bridges

NW 308th ST over Castile CR

Fair

Clinton County, Missouri · S 20 T 56 N R 32 W · Structure no. 22490

Built
1982
43 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
75 ft
2 main spans
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

NW 308th ST over Castile CR is a steel stringer/multi-beam or girder carrying NW 308th ST over Castile CR in Clinton County, Missouri. It was built in 1982, so it is 43 years old, younger 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 46 by 2043. The structure is 75 ft (22.9 m) long and 19 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNW 308th ST
CrossesCastile CR
LocationS 20 T 56 N R 32 W
RouteCounty Highway 359
CountyClinton County
StateMissouri
Coordinates39.64747, -94.51503
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.7 US tons
Inventory rating18.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length75 ft (22.9 m)
Longest span74 ft (22.6 m)
Deck width19 ft (5.9 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic46 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$385,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 308th ST over Castile CR built?

It was built in 1982, making it 43 years old in 2025.

What condition is NW 308th ST over Castile 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 December 2024.

How much traffic does NW 308th ST over Castile CR carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NW 308th ST over Castile CR?

The structure is 75 ft (22.9 m) long with a longest span of 74 ft (22.6 m) and a deck 19 ft wide.

Who owns NW 308th ST over Castile CR?

It is owned by the County Highway Agency.