US Bridges

Dupont HWY/US13 over Isaacs Branch

Fair

Kent County, Delaware · South of Dover · Structure no. 2003A024

Built
1952
73 years old
Condition
Fair
inspected October 2021
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
38,782
2020 count
Owner
State
State Highway Agency

About this bridge

Dupont HWY/US13 over Isaacs Branch is a concrete culvert carrying Dupont HWY/US13 over Isaacs Branch in Kent County, Delaware. It was built in 1952, so it is 73 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 38,782 vehicles a day, roughly 7% of them trucks, projected to reach 48,203 by 2042. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesDupont HWY/US13
CrossesIsaacs Branch
LocationSouth of Dover
RouteU.S. Route 13
CountyKent County
StateDelaware
Coordinates39.12363, -75.53236
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,782 (2020)
Projected traffic48,203 by 2042
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dupont HWY/US13 over Isaacs Branch built?

It was built in 1952, making it 73 years old in 2025.

What condition is Dupont HWY/US13 over Isaacs Branch 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 October 2021.

How much traffic does Dupont HWY/US13 over Isaacs Branch carry?

About 38,782 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is Dupont HWY/US13 over Isaacs Branch?

The structure is 34 ft (10.4 m) long with a longest span of 12 ft (3.7 m).

Who owns Dupont HWY/US13 over Isaacs Branch?

It is owned by the State Highway Agency.