US Bridges

Comus Road over Is 270

Fair

Montgomery County, Maryland · 1.3 MI N of Md 121 · Structure no. 100000150037010

Built
1952
73 years old, rebuilt 1976
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
216 ft
4 main spans
Daily traffic
2,540
2018 count
Owner
State
State Highway Agency

About this bridge

Comus Road over Is 270 is a steel stringer/multi-beam or girder carrying Comus Road over Is 270 in Montgomery County, Maryland. It was built in 1952 and reconstructed in 1976, so it is 73 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 2,540 vehicles a day, roughly 5% of them trucks, projected to reach 4,081 by 2038. The structure is 216 ft (65.8 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesComus Road
CrossesIs 270
Location1.3 MI N of Md 121
RouteCounty Highway 200
CountyMontgomery County
StateMaryland
Coordinates39.24697, -77.29869
Functional classRural Minor 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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating70 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length216 ft (65.8 m)
Longest span67 ft (20.4 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,540 (2018)
Projected traffic4,081 by 2038
Trucks5%
Lanes on structure2
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 Comus Road over Is 270 built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1976.

What condition is Comus Road over Is 270 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 November 2024.

How much traffic does Comus Road over Is 270 carry?

About 2,540 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Comus Road over Is 270?

The structure is 216 ft (65.8 m) long with a longest span of 67 ft (20.4 m) and a deck 32 ft wide.

Who owns Comus Road over Is 270?

It is owned by the State Highway Agency.