US Bridges

Md 45 over Gunpowder Falls

Fair

Baltimore County, Maryland · 1.75 Mile North of Md 137 · Structure no. 100000030048010

Built
1924
101 years old
Condition
Fair
inspected January 2024
Type
Arch - Deck
Concrete
Length
64 ft
1 main span
Daily traffic
5,350
2009 count
Owner
State
State Highway Agency

About this bridge

Md 45 over Gunpowder Falls is a concrete arch - deck carrying Md 45 over Gunpowder Falls in Baltimore County, Maryland. It was built in 1924, so it is 101 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 5,350 vehicles a day, roughly 8% of them trucks, projected to reach 5,767 by 2026. The structure is 64 ft (19.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

No coordinates are recorded for this structure.

CarriesMd 45
CrossesGunpowder Falls
Location1.75 Mile North of Md 137
RouteState Highway 45
CountyBaltimore County
StateMaryland
Functional classRural Major 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.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 12 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span64 ft (19.5 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,350 (2009)
Projected traffic5,767 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$141,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 45 over Gunpowder Falls built?

It was built in 1924, making it 101 years old in 2025.

What condition is Md 45 over Gunpowder Falls 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 January 2024.

How much traffic does Md 45 over Gunpowder Falls carry?

About 5,350 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 45 over Gunpowder Falls?

The structure is 64 ft (19.5 m) long with a longest span of 64 ft (19.5 m) and a deck 27 ft wide.

Who owns Md 45 over Gunpowder Falls?

It is owned by the State Highway Agency.