US Bridges

Watkins Mill Road over Cabin Branch

Fair

Montgomery County, Maryland · .4 MI S of Apple Ridge RD · Structure no. 200000M-0222010

Built
1990
35 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
115 ft
1 main span
Daily traffic
12,768
2023 count
Owner
County
County Highway Agency

About this bridge

Watkins Mill Road over Cabin Branch is a steel stringer/multi-beam or girder carrying Watkins Mill Road over Cabin Branch in Montgomery County, Maryland. It was built in 1990, so it is 35 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 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 12,768 vehicles a day, roughly 5% of them trucks, projected to reach 15,514 by 2043. The structure is 115 ft (35.1 m) long and 70 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesWatkins Mill Road
CrossesCabin Branch
Location.4 MI S of Apple Ridge RD
RouteCounty Highway 3770
CountyMontgomery County
StateMaryland
Coordinates39.1792, -77.20976
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span110 ft (33.5 m)
Deck width70 ft (21.3 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,768 (2023)
Projected traffic15,514 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Watkins Mill Road over Cabin Branch built?

It was built in 1990, making it 35 years old in 2025.

What condition is Watkins Mill Road over Cabin Branch 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 August 2023.

How much traffic does Watkins Mill Road over Cabin Branch carry?

About 12,768 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Watkins Mill Road over Cabin Branch?

The structure is 115 ft (35.1 m) long with a longest span of 110 ft (33.5 m) and a deck 70 ft wide.

Who owns Watkins Mill Road over Cabin Branch?

It is owned by the County Highway Agency.