US Bridges

Md 91 over North Branch Patapsco Ri

Fair

Carroll County, Maryland · .04 Mile North of Md 879D · Structure no. 100000060020010

Built
1965
60 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
175 ft
3 main spans
Daily traffic
5,640
2009 count
Owner
State
State Highway Agency

About this bridge

Md 91 over North Branch Patapsco Ri is a steel stringer/multi-beam or girder carrying Md 91 over North Branch Patapsco Ri in Carroll County, Maryland. It was built in 1965, so it is 60 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 5,640 vehicles a day, roughly 8% of them trucks, projected to reach 8,460 by 2029. The structure is 175 ft (53.3 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMd 91
CrossesNorth Branch Patapsco Ri
Location.04 Mile North of Md 879D
RouteState Highway 91
CountyCarroll County
StateMaryland
Coordinates39.49984, -76.88269
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating63.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span58 ft (17.7 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,640 (2009)
Projected traffic8,460 by 2029
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 91 over North Branch Patapsco Ri built?

It was built in 1965, making it 60 years old in 2025.

What condition is Md 91 over North Branch Patapsco Ri 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 2023.

How much traffic does Md 91 over North Branch Patapsco Ri carry?

About 5,640 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 91 over North Branch Patapsco Ri?

The structure is 175 ft (53.3 m) long with a longest span of 58 ft (17.7 m) and a deck 35 ft wide.

Who owns Md 91 over North Branch Patapsco Ri?

It is owned by the State Highway Agency.