US Bridges

Md 45 over Fourth Mine Branch

Fair

Baltimore County, Maryland · 0.14 M N of Br No 0304600 · Structure no. 100000030301010

Built
1930
95 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
5,340
2010 count
Owner
State
State Highway Agency

About this bridge

Md 45 over Fourth Mine Branch is a concrete slab carrying Md 45 over Fourth Mine Branch in Baltimore County, 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 5,340 vehicles a day, roughly 8% of them trucks, projected to reach 5,767 by 2026. The structure is 33 ft (10.1 m) long and 111 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

No coordinates are recorded for this structure.

CarriesMd 45
CrossesFourth Mine Branch
Location0.14 M N of Br No 0304600
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.5 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span28 ft (8.5 m)
Deck width111 ft (33.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,340 (2010)
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 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 Md 45 over Fourth Mine Branch built?

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

What condition is Md 45 over Fourth Mine 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 October 2023.

How much traffic does Md 45 over Fourth Mine Branch carry?

About 5,340 vehicles per day (2010 count), of which roughly 8% are trucks.

How long is Md 45 over Fourth Mine Branch?

The structure is 33 ft (10.1 m) long with a longest span of 28 ft (8.5 m) and a deck 111 ft wide.

Who owns Md 45 over Fourth Mine Branch?

It is owned by the State Highway Agency.