US Bridges

12th ST-I495 Ramp over 48" Pipe / Drainage Area

Fair

New Castle County, Delaware · Wilmington · Structure no. 1816 6231

Built
1976
49 years old
Condition
Fair
inspected February 2022
Type
Slab
Concrete Continuous
Length
89 ft
3 main spans
Daily traffic
1,012
2020 count
Owner
State
State Highway Agency

About this bridge

12th ST-I495 Ramp over 48" Pipe / Drainage Area is a concrete continuous slab carrying 12th ST-I495 Ramp over 48" Pipe / Drainage Area in New Castle County, Delaware. It was built in 1976, so it is 49 years old, older than the Delaware average of 47.3 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.

It carries about 1,012 vehicles a day, roughly 9% of them trucks, projected to reach 1,257 by 2042. The structure is 89 ft (27.2 m) long and 26 ft wide.

Location

Open in Google Maps
Carries12th ST-I495 Ramp
Crosses48" Pipe / Drainage Area
LocationWilmington
RouteInterstate 495
CountyNew Castle County
StateDelaware
Coordinates39.73611, -75.51954
Functional classUrban Principal Arterial - Interstate

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length89 ft (27.2 m)
Longest span40 ft (12.2 m)
Deck width26 ft (8 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,012 (2020)
Projected traffic1,257 by 2042
Trucks9%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was 12th ST-I495 Ramp over 48" Pipe / Drainage Area built?

It was built in 1976, making it 49 years old in 2025.

What condition is 12th ST-I495 Ramp over 48" Pipe / Drainage Area 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 February 2022.

How much traffic does 12th ST-I495 Ramp over 48" Pipe / Drainage Area carry?

About 1,012 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is 12th ST-I495 Ramp over 48" Pipe / Drainage Area?

The structure is 89 ft (27.2 m) long with a longest span of 40 ft (12.2 m) and a deck 26 ft wide.

Who owns 12th ST-I495 Ramp over 48" Pipe / Drainage Area?

It is owned by the State Highway Agency.