US Bridges

Willowdale Drive over Rock Creek

Fair

Frederick County, Maryland · 0.4 MI North of US 40 · Structure no. 200000F-F-19030

Built
1976
49 years old
Condition
Fair
inspected July 2024
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
30 ft
2 main spans
Daily traffic
11,232
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Willowdale Drive over Rock Creek is a aluminum, wrought iron, or cast iron culvert carrying Willowdale Drive over Rock Creek in Frederick County, Maryland. It was built in 1976, so it is 49 years old, younger than the Maryland average of 52.6 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 11,232 vehicles a day, roughly 4% of them trucks, projected to reach 16,695 by 2039. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWillowdale Drive
CrossesRock Creek
Location0.4 MI North of US 40
RouteCity Street 1575
CountyFrederick County
StateMaryland
Coordinates39.42343, -77.44821
Functional classUrban Collector

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 2024
Inspection intervalevery 24 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 rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadH 15
Structure length30 ft (9.1 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,232 (2019)
Projected traffic16,695 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Willowdale Drive over Rock Creek built?

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

What condition is Willowdale Drive over Rock 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 2024.

How much traffic does Willowdale Drive over Rock Creek carry?

About 11,232 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is Willowdale Drive over Rock Creek?

The structure is 30 ft (9.1 m) long with a longest span of 13 ft (4 m).

Who owns Willowdale Drive over Rock Creek?

It is owned by the City or Municipal Highway Agency.