US Bridges

Md 543 over Br of Bynum Run

Fair

Harford County, Maryland · 0.3 Mile North of Md 136 · Structure no. 100000120050010

Built
1936
89 years old, rebuilt 1959
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
14,221
2009 count
Owner
State
State Highway Agency

About this bridge

Md 543 over Br of Bynum Run is a steel stringer/multi-beam or girder carrying Md 543 over Br of Bynum Run in Harford County, Maryland. It was built in 1936 and reconstructed in 1959, so it is 89 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 14,221 vehicles a day, roughly 8% of them trucks, projected to reach 18,126 by 2026. The structure is 22 ft (6.7 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMd 543
CrossesBr of Bynum Run
Location0.3 Mile North of Md 136
RouteState Highway 543
CountyHarford County
StateMaryland
Coordinates39.50843, -76.27515
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2025
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,221 (2009)
Projected traffic18,126 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$46,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 543 over Br of Bynum Run built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1959.

What condition is Md 543 over Br of Bynum 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 January 2025.

How much traffic does Md 543 over Br of Bynum Run carry?

About 14,221 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 543 over Br of Bynum Run?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 31 ft wide.

Who owns Md 543 over Br of Bynum Run?

It is owned by the State Highway Agency.