US Bridges

Palmer Road South over Stone Lake Rd/Parking Lt

Fair

Montgomery County, Maryland · 600M E of Wood RD · Structure no. 1MD260E

Built
1981
44 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
272 ft
3 main spans
Daily traffic
2,750
2015 count
Owner
Federal
Navy / Marines

About this bridge

Palmer Road South over Stone Lake Rd/Parking Lt is a concrete continuous box beam or girders - single or spread carrying Palmer Road South over Stone Lake Rd/Parking Lt in Montgomery County, Maryland. It was built in 1981, so it is 44 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 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 2,750 vehicles a day, roughly 5% of them trucks, projected to reach 3,300 by 2040. The structure is 272 ft (82.9 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPalmer Road South
CrossesStone Lake Rd/Parking Lt
Location600M E of Wood RD
CountyMontgomery County
StateMaryland
Coordinates39.00091, -77.09026
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating32.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length272 ft (82.9 m)
Longest span110 ft (33.5 m)
Deck width38 ft (11.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2015)
Projected traffic3,300 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNavy / Marines
Maintained byNavy / Marines
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$41,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Palmer Road South over Stone Lake Rd/Parking Lt built?

It was built in 1981, making it 44 years old in 2025.

What condition is Palmer Road South over Stone Lake Rd/Parking Lt 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 2023.

How much traffic does Palmer Road South over Stone Lake Rd/Parking Lt carry?

About 2,750 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Palmer Road South over Stone Lake Rd/Parking Lt?

The structure is 272 ft (82.9 m) long with a longest span of 110 ft (33.5 m) and a deck 38 ft wide.

Who owns Palmer Road South over Stone Lake Rd/Parking Lt?

It is owned by the Navy / Marines.