US Bridges

San Martin Drive over Stoney Run

Fair

Baltimore city, Maryland · 0.5 MI N Howard & 29th ST · Structure no. 200000BC8016010

Built
1930
95 years old
Condition
Fair
inspected March 2024
Type
Arch - Deck
Concrete
Length
30 ft
1 main span
Daily traffic
2,220
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

San Martin Drive over Stoney Run is a concrete arch - deck carrying San Martin Drive over Stoney Run in Baltimore city, Maryland. It was built in 1930, so it is 95 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 2,220 vehicles a day, roughly 5% of them trucks, projected to reach 2,604 by 2042. The structure is 30 ft (9.1 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSan Martin Drive
CrossesStoney Run
Location0.5 MI N Howard & 29th ST
RouteCity Street 1701
CountyBaltimore city
StateMaryland
Coordinates39.32836, -76.62292
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73 US tons
Inventory rating53 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,220 (2022)
Projected traffic2,604 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$61,000
NavigationNo navigation control on waterway

Frequently asked questions

When was San Martin Drive over Stoney Run built?

It was built in 1930, making it 95 years old in 2025.

What condition is San Martin Drive over Stoney Run 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 March 2024.

How much traffic does San Martin Drive over Stoney Run carry?

About 2,220 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is San Martin Drive over Stoney Run?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 35 ft wide.

Who owns San Martin Drive over Stoney Run?

It is owned by the City or Municipal Highway Agency.