US Bridges

Md 187 over Is 270

Good

Montgomery County, Maryland · 0.404 M N/Democracy Blvd · Structure no. 100000150079010

Built
2002
23 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
221 ft
2 main spans
Daily traffic
45,401
2009 count
Owner
State
State Highway Agency

About this bridge

Md 187 over Is 270 is a steel continuous stringer/multi-beam or girder carrying Md 187 over Is 270 in Montgomery County, Maryland. It was built in 2002, so it is 23 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 45,401 vehicles a day, roughly 3% of them trucks, projected to reach 51,355 by 2026. The structure is 221 ft (67.4 m) long and 146 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesMd 187
CrossesIs 270
Location0.404 M N/Democracy Blvd
RouteState Highway 187
Coordinates39.03028, -77.12629
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than 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 rating91.5 US tons
Inventory rating54.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length221 ft (67.4 m)
Longest span110 ft (33.5 m)
Deck width146 ft (44.6 m)
Roadway width129 ft (39.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,401 (2009)
Projected traffic51,355 by 2026
Trucks3%
Lanes on structure11
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 Md 187 over Is 270 built?

It was built in 2002, making it 23 years old in 2025.

What condition is Md 187 over Is 270 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Md 187 over Is 270 carry?

About 45,401 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is Md 187 over Is 270?

The structure is 221 ft (67.4 m) long with a longest span of 110 ft (33.5 m) and a deck 146 ft wide.

Who owns Md 187 over Is 270?

It is owned by the State Highway Agency.