US Bridges

Seneca Drive over US 29 and Ramp I(7)

Fair

Howard County, Maryland · 0.65 Mile North of Md 32 · Structure no. 100000130131010

Built
1993
32 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
263 ft
2 main spans
Daily traffic
5,031
2009 count
Owner
State
State Highway Agency

About this bridge

Seneca Drive over US 29 and Ramp I(7) is a steel continuous stringer/multi-beam or girder carrying Seneca Drive over US 29 and Ramp I(7) in Howard County, Maryland. It was built in 1993, so it is 32 years old, younger 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 5,031 vehicles a day, roughly 8% of them trucks, projected to reach 5,790 by 2025. The structure is 263 ft (80.2 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSeneca Drive
CrossesUS 29 and Ramp I(7)
Location0.65 Mile North of Md 32
RouteCounty Highway 412
CountyHoward County
StateMaryland
Coordinates39.18983, -76.86956
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating69.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length263 ft (80.2 m)
Longest span130 ft (39.6 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,031 (2009)
Projected traffic5,790 by 2025
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 Seneca Drive over US 29 and Ramp I(7) built?

It was built in 1993, making it 32 years old in 2025.

What condition is Seneca Drive over US 29 and Ramp I(7) 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 April 2024.

How much traffic does Seneca Drive over US 29 and Ramp I(7) carry?

About 5,031 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Seneca Drive over US 29 and Ramp I(7)?

The structure is 263 ft (80.2 m) long with a longest span of 130 ft (39.6 m) and a deck 37 ft wide.

Who owns Seneca Drive over US 29 and Ramp I(7)?

It is owned by the State Highway Agency.