US Bridges

County RD 420 over Br of Dry CR

FairPosted for load

Bollinger County, Missouri · S 15 T 29 N R 10 E · Structure no. 17424

Built
1928
97 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 420 over Br of Dry CR is a steel stringer/multi-beam or girder carrying County RD 420 over Br of Dry CR in Bollinger County, Missouri. It was built in 1928, so it is 97 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 46 by 2044. The structure is 25 ft (7.6 m) long and 14 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty RD 420
CrossesBr of Dry CR
LocationS 15 T 29 N R 10 E
RouteCounty Highway 152
CountyBollinger County
StateMissouri
Coordinates37.17958, -89.93974
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating10.9 US tons
Inventory rating7.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width14 ft (4.4 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic46 by 2044
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$255,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 420 over Br of Dry CR built?

It was built in 1928, making it 97 years old in 2025.

What condition is County RD 420 over Br of Dry 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 2023.

How much traffic does County RD 420 over Br of Dry CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 420 over Br of Dry CR?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 14 ft wide.

Who owns County RD 420 over Br of Dry CR?

It is owned by the County Highway Agency.