US Bridges

Kemp Mill Road over Northwest Branch Tributa

Fair

Montgomery County, Maryland · 200 Ft S of Glenallan Ave · Structure no. 200000M-0350020

Built
1964
61 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
21 ft
Daily traffic
8,485
2023 count
Owner
County
County Highway Agency

About this bridge

Kemp Mill Road over Northwest Branch Tributa is a concrete culvert carrying Kemp Mill Road over Northwest Branch Tributa in Montgomery County, Maryland. It was built in 1964, so it is 61 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 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 8,485 vehicles a day, roughly 5% of them trucks, projected to reach 11,453 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesKemp Mill Road
CrossesNorthwest Branch Tributa
Location200 Ft S of Glenallan Ave
RouteCounty Highway 123
CountyMontgomery County
StateMaryland
Coordinates39.062, -77.02666
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,485 (2023)
Projected traffic11,453 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$8,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Kemp Mill Road over Northwest Branch Tributa built?

It was built in 1964, making it 61 years old in 2025.

What condition is Kemp Mill Road over Northwest Branch Tributa 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 2024.

How much traffic does Kemp Mill Road over Northwest Branch Tributa carry?

About 8,485 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Kemp Mill Road over Northwest Branch Tributa?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Kemp Mill Road over Northwest Branch Tributa?

It is owned by the County Highway Agency.