US Bridges

Limestone RD / SR7 over Mill Creek

Fair

New Castle County, Delaware · S. of Delcastle Rec. Area · Structure no. 1190 031

Built
1962
63 years old
Condition
Fair
inspected July 2022
Type
Culvert
Concrete
Length
48 ft
3 main spans
Daily traffic
33,443
2021 count
Owner
State
State Highway Agency

About this bridge

Limestone RD / SR7 over Mill Creek is a concrete culvert carrying Limestone RD / SR7 over Mill Creek in New Castle County, Delaware. It was built in 1962, so it is 63 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 33,443 vehicles a day, roughly 8% of them trucks, projected to reach 47,554 by 2042. The structure is 48 ft (14.6 m) long and 106 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLimestone RD / SR7
CrossesMill Creek
LocationS. of Delcastle Rec. Area
RouteState Highway 7
CountyNew Castle County
StateDelaware
Coordinates39.7337, -75.67364
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 inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating101.7 US tons
Inventory rating79.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span15 ft (4.7 m)
Deck width106 ft (32.2 m)
Roadway width87 ft (26.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,443 (2021)
Projected traffic47,554 by 2042
Trucks8%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Limestone RD / SR7 over Mill Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Limestone RD / SR7 over Mill Creek 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 2022.

How much traffic does Limestone RD / SR7 over Mill Creek carry?

About 33,443 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Limestone RD / SR7 over Mill Creek?

The structure is 48 ft (14.6 m) long with a longest span of 15 ft (4.7 m) and a deck 106 ft wide.

Who owns Limestone RD / SR7 over Mill Creek?

It is owned by the State Highway Agency.