US Bridges

County RD 151 over Alder Br

FairPosted for load

Cedar County, Missouri · S 20 T 35 N R 28 W · Structure no. 17315

Built
1954
71 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
34 ft
2 main spans
Daily traffic
45
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 151 over Alder Br is a steel continuous stringer/multi-beam or girder carrying County RD 151 over Alder Br in Cedar County, Missouri. It was built in 1954, so it is 71 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 45 vehicles a day, roughly 10% of them trucks, projected to reach 56 by 2043. The structure is 34 ft (10.4 m) long and 14 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty RD 151
CrossesAlder Br
LocationS 20 T 35 N R 28 W
RouteCounty Highway 148
CountyCedar County
StateMissouri
Coordinates37.79276, -94.04399
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.
Substructure7 GoodSome minor problems.
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 statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18.8 US tons
Inventory rating11.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span16 ft (4.9 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (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 byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 151 over Alder Br built?

It was built in 1954, making it 71 years old in 2025.

What condition is County RD 151 over Alder 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 December 2024.

How much traffic does County RD 151 over Alder Br carry?

About 45 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 151 over Alder Br?

The structure is 34 ft (10.4 m) long with a longest span of 16 ft (4.9 m) and a deck 14 ft wide.

Who owns County RD 151 over Alder Br?

It is owned by the County Highway Agency.