US Bridges

Walnut ST over Mispillion River

Good

Kent County, Delaware · Milford · Structure no. 2502 020

Built
1987
38 years old
Condition
Good
inspected August 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
4,888
2020 count
Owner
State
State Highway Agency

About this bridge

Walnut ST over Mispillion River is a prestressed concrete box beam or girders - multiple carrying Walnut ST over Mispillion River in Kent County, Delaware. It was built in 1987, so it is 38 years old, younger 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 4,888 vehicles a day, roughly 7% of them trucks, projected to reach 6,075 by 2042. The structure is 36 ft (11 m) long and 50 ft wide.

Location

Open in Google Maps
CarriesWalnut ST
CrossesMispillion River
LocationMilford
RouteCounty Highway 20
CountyKent County
StateDelaware
Coordinates38.91331, -75.42838
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating58.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length36 ft (11 m)
Longest span33 ft (10.1 m)
Deck width50 ft (15.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,888 (2020)
Projected traffic6,075 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 Walnut ST over Mispillion River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Walnut ST over Mispillion River 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 August 2021.

How much traffic does Walnut ST over Mispillion River carry?

About 4,888 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is Walnut ST over Mispillion River?

The structure is 36 ft (11 m) long with a longest span of 33 ft (10.1 m) and a deck 50 ft wide.

Who owns Walnut ST over Mispillion River?

It is owned by the State Highway Agency.