US Bridges

Danby RD E over Is 55

Fair

Jefferson County, Missouri · S 12 T 39 N R 6 E · Structure no. 1670

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
255 ft
4 main spans
Daily traffic
1,024
2024 count
Owner
State
State Highway Agency

About this bridge

Danby RD E over Is 55 is a steel continuous stringer/multi-beam or girder carrying Danby RD E over Is 55 in Jefferson County, Missouri. It was built in 1970, so it is 55 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 1,024 vehicles a day, roughly 11% of them trucks, projected to reach 1,843 by 2044. The structure is 255 ft (77.7 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesDanby RD E
CrossesIs 55
LocationS 12 T 39 N R 6 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.10971, -90.30635
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.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.8 US tons
Inventory rating18.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length255 ft (77.7 m)
Longest span86 ft (26.2 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,024 (2024)
Projected traffic1,843 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Danby RD E over Is 55 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Danby RD E over Is 55 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 July 2023.

How much traffic does Danby RD E over Is 55 carry?

About 1,024 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Danby RD E over Is 55?

The structure is 255 ft (77.7 m) long with a longest span of 86 ft (26.2 m) and a deck 31 ft wide.

Who owns Danby RD E over Is 55?

It is owned by the State Highway Agency.