US Bridges

US 1 NB over Little Patuxent River

Fair

Howard County, Maryland · 0.38 Mile South of Md 32 · Structure no. 100000130007011

Built
1955
70 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
216 ft
3 main spans
Daily traffic
19,773
2012 count
Owner
State
State Highway Agency

About this bridge

US 1 NB over Little Patuxent River is a steel continuous stringer/multi-beam or girder carrying US 1 NB over Little Patuxent River in Howard County, Maryland. It was built in 1955, so it is 70 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 6 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 19,773 vehicles a day, roughly 8% of them trucks, projected to reach 25,706 by 2032. The structure is 216 ft (65.8 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 1 NB
CrossesLittle Patuxent River
Location0.38 Mile South of Md 32
RouteU.S. Route 1
CountyHoward County
StateMaryland
Coordinates39.13398, -76.8162
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.5 US tons
Inventory rating54.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length216 ft (65.8 m)
Longest span82 ft (25 m)
Deck width37 ft (11.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,773 (2012)
Projected traffic25,706 by 2032
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$531,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 NB over Little Patuxent River built?

It was built in 1955, making it 70 years old in 2025.

What condition is US 1 NB over Little Patuxent River 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 June 2024.

How much traffic does US 1 NB over Little Patuxent River carry?

About 19,773 vehicles per day (2012 count), of which roughly 8% are trucks.

How long is US 1 NB over Little Patuxent River?

The structure is 216 ft (65.8 m) long with a longest span of 82 ft (25 m) and a deck 37 ft wide.

Who owns US 1 NB over Little Patuxent River?

It is owned by the State Highway Agency.