US Bridges

Willow Grove Rd. over Cow Marsh Branch

Good

Kent County, Delaware · S/W of Willow Grove · Structure no. 2053D053

Built
1959
66 years old
Condition
Good
inspected October 2021
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
3,341
2020 count
Owner
State
State Highway Agency

About this bridge

Willow Grove Rd. over Cow Marsh Branch is a concrete slab carrying Willow Grove Rd. over Cow Marsh Branch in Kent County, Delaware. It was built in 1959, so it is 66 years old, older than the Delaware average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,341 vehicles a day, roughly 9% of them trucks, projected to reach 4,152 by 2042. The structure is 27 ft (8.2 m) long and 42 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesWillow Grove Rd.
CrossesCow Marsh Branch
LocationS/W of Willow Grove
RouteState Highway 10
CountyKent County
StateDelaware
Coordinates39.06298, -75.63423
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating43.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,341 (2020)
Projected traffic4,152 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Willow Grove Rd. over Cow Marsh Branch built?

It was built in 1959, making it 66 years old in 2025.

What condition is Willow Grove Rd. over Cow Marsh Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2021.

How much traffic does Willow Grove Rd. over Cow Marsh Branch carry?

About 3,341 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is Willow Grove Rd. over Cow Marsh Branch?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 42 ft wide.

Who owns Willow Grove Rd. over Cow Marsh Branch?

It is owned by the State Highway Agency.