US Bridges

Marriottsville RD over Is 70

Fair

Howard County, Maryland · 0.91 MI E of US 40 · Structure no. 100000130053010

Built
1968
57 years old, rebuilt 1974
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
250 ft
2 main spans
Daily traffic
18,047
2006 count
Owner
State
State Highway Agency

About this bridge

Marriottsville RD over Is 70 is a steel stringer/multi-beam or girder carrying Marriottsville RD over Is 70 in Howard County, Maryland. It was built in 1968 and reconstructed in 1974, so it is 57 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 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 18,047 vehicles a day, roughly 5% of them trucks, projected to reach 20,808 by 2026. The structure is 250 ft (76.2 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMarriottsville RD
CrossesIs 70
Location0.91 MI E of US 40
RouteCounty Highway 70
CountyHoward County
StateMaryland
Coordinates39.30378, -76.89931
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length250 ft (76.2 m)
Longest span122 ft (37.2 m)
Deck width39 ft (11.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,047 (2006)
Projected traffic20,808 by 2026
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$644,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Marriottsville RD over Is 70 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1974.

What condition is Marriottsville RD 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 Marriottsville RD over Is 70 carry?

About 18,047 vehicles per day (2006 count), of which roughly 5% are trucks.

How long is Marriottsville RD over Is 70?

The structure is 250 ft (76.2 m) long with a longest span of 122 ft (37.2 m) and a deck 39 ft wide.

Who owns Marriottsville RD over Is 70?

It is owned by the State Highway Agency.