US Bridges

Md 75 over Is 70

Fair

Frederick County, Maryland · 0.24 MI S of Md 144FB · Structure no. 100000100156010

Built
1973
52 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
269 ft
2 main spans
Daily traffic
9,752
2006 count
Owner
State
State Highway Agency

About this bridge

Md 75 over Is 70 is a steel continuous stringer/multi-beam or girder carrying Md 75 over Is 70 in Frederick County, Maryland. It was built in 1973, so it is 52 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 5 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 9,752 vehicles a day, roughly 8% of them trucks, projected to reach 11,244 by 2026. The structure is 269 ft (82 m) long and 91 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 75
CrossesIs 70
Location0.24 MI S of Md 144FB
RouteState Highway 75
CountyFrederick County
StateMaryland
Coordinates39.38139, -77.26008
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.5 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length269 ft (82 m)
Longest span132 ft (40.2 m)
Deck width91 ft (27.8 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deck55 ft (16.7 m)

Traffic and service

Average daily traffic9,752 (2006)
Projected traffic11,244 by 2026
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 Md 75 over Is 70 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Md 75 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 September 2023.

How much traffic does Md 75 over Is 70 carry?

About 9,752 vehicles per day (2006 count), of which roughly 8% are trucks.

How long is Md 75 over Is 70?

The structure is 269 ft (82 m) long with a longest span of 132 ft (40.2 m) and a deck 91 ft wide.

Who owns Md 75 over Is 70?

It is owned by the State Highway Agency.