US Bridges

County RD 1100 over Trib Spring Rvr

Fair

Lawrence County, Missouri · S 21 T 27 N R 27 W · Structure no. 23755

Built
1940
85 years old, rebuilt 1983
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 1100 over Trib Spring Rvr is a concrete continuous slab carrying County RD 1100 over Trib Spring Rvr in Lawrence County, Missouri. It was built in 1940 and reconstructed in 1983, so it is 85 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 56 by 2043. The structure is 27 ft (8.2 m) long and 19 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty RD 1100
CrossesTrib Spring Rvr
LocationS 21 T 27 N R 27 W
RouteCounty Highway 430
CountyLawrence County
StateMissouri
Coordinates37.04121, -93.87895
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.
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 inspectionMarch 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating38.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length27 ft (8.2 m)
Longest span13 ft (4 m)
Deck width19 ft (5.8 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic56 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 1100 over Trib Spring Rvr built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1983.

What condition is County RD 1100 over Trib Spring Rvr 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 March 2023.

How much traffic does County RD 1100 over Trib Spring Rvr carry?

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

How long is County RD 1100 over Trib Spring Rvr?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (4 m) and a deck 19 ft wide.

Who owns County RD 1100 over Trib Spring Rvr?

It is owned by the County Highway Agency and maintained by the Other Local Agency.