US Bridges

US 15 Nbr over Md 550

Fair

Frederick County, Maryland · 0.36 Mile North of Md 15D · Structure no. 100000100154010

Built
1972
53 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
172 ft
1 main span
Daily traffic
27,210
2009 count
Owner
State
State Highway Agency

About this bridge

US 15 Nbr over Md 550 is a steel stringer/multi-beam or girder carrying US 15 Nbr over Md 550 in Frederick County, Maryland. It was built in 1972, so it is 53 years old, older 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 27,210 vehicles a day, roughly 8% of them trucks, projected to reach 46,450 by 2029. The structure is 172 ft (52.4 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 15 Nbr
CrossesMd 550
Location0.36 Mile North of Md 15D
RouteU.S. Route 15
CountyFrederick County
StateMaryland
Coordinates39.6347, -77.41092
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating46.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length172 ft (52.4 m)
Longest span97 ft (29.6 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,210 (2009)
Projected traffic46,450 by 2029
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 15 Nbr over Md 550 built?

It was built in 1972, making it 53 years old in 2025.

What condition is US 15 Nbr over Md 550 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 June 2024.

How much traffic does US 15 Nbr over Md 550 carry?

About 27,210 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 15 Nbr over Md 550?

The structure is 172 ft (52.4 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.

Who owns US 15 Nbr over Md 550?

It is owned by the State Highway Agency.