US Bridges

US 15 & Ramp 8 over Carroll Creek

Fair

Frederick County, Maryland · 0.64 Mile North of US 40 · Structure no. 100000100020020

Built
1958
67 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
52 ft
Daily traffic
95,190
2009 count
Owner
State
State Highway Agency

About this bridge

US 15 & Ramp 8 over Carroll Creek is a concrete culvert carrying US 15 & Ramp 8 over Carroll Creek in Frederick County, Maryland. It was built in 1958, so it is 67 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 95,190 vehicles a day, roughly 8% of them trucks, projected to reach 132,830 by 2029. The structure is 52 ft (15.9 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 15 & Ramp 8
CrossesCarroll Creek
Location0.64 Mile North of US 40
RouteU.S. Route 15
CountyFrederick County
StateMaryland
Coordinates39.42327, -77.42908
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadHS 20
Structure length52 ft (15.9 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95,190 (2009)
Projected traffic132,830 by 2029
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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 US 15 & Ramp 8 over Carroll Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is US 15 & Ramp 8 over Carroll 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 April 2024.

How much traffic does US 15 & Ramp 8 over Carroll Creek carry?

About 95,190 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 15 & Ramp 8 over Carroll Creek?

The structure is 52 ft (15.9 m) long with a longest span of 17 ft (5.2 m).

Who owns US 15 & Ramp 8 over Carroll Creek?

It is owned by the State Highway Agency.