US Bridges

Ridge Road over Is 70

Fair

Frederick County, Maryland · 1.57 MI W of US 40 · Structure no. 100000100155010

Built
1972
53 years old
Condition
Fair
inspected June 2024
Type
Arch - Deck
Steel
Length
393 ft
1 main span
Daily traffic
1,374
2023 count
Owner
State
State Highway Agency

About this bridge

Ridge Road over Is 70 is a steel arch - deck carrying Ridge Road over Is 70 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 1,374 vehicles a day, roughly 3% of them trucks, projected to reach 1,790 by 2045. The structure is 393 ft (119.8 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesRidge Road
CrossesIs 70
Location1.57 MI W of US 40
RouteCounty Highway 237
CountyFrederick County
StateMaryland
Coordinates39.44376, -77.50063
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating28 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length393 ft (119.8 m)
Longest span250 ft (76.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,374 (2023)
Projected traffic1,790 by 2045
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ridge Road over Is 70 built?

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

What condition is Ridge Road over Is 70 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 Ridge Road over Is 70 carry?

About 1,374 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Ridge Road over Is 70?

The structure is 393 ft (119.8 m) long with a longest span of 250 ft (76.2 m) and a deck 35 ft wide.

Who owns Ridge Road over Is 70?

It is owned by the State Highway Agency.