US Bridges

Seneca Drive over Beaver Run Branch

Poor

Howard County, Maryland · 0.5 MI E of US RTE 29 · Structure no. 200000HO0060010

Built
1960
65 years old
Condition
Poor
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
1,985
2022 count
Owner
County
County Highway Agency

About this bridge

Seneca Drive over Beaver Run Branch is a prestressed concrete box beam or girders - multiple carrying Seneca Drive over Beaver Run Branch in Howard County, Maryland. It was built in 1960, so it is 65 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,985 vehicles a day, roughly 4% of them trucks, projected to reach 2,674 by 2042. The structure is 34 ft (10.5 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSeneca Drive
CrossesBeaver Run Branch
Location0.5 MI E of US RTE 29
RouteCounty Highway 412
Coordinates39.18714, -76.86297
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.5 US tons
Inventory rating42.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length34 ft (10.5 m)
Longest span33 ft (10.1 m)
Deck width33 ft (10.2 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,985 (2022)
Projected traffic2,674 by 2042
Trucks4%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Beaver Run Branch built?

It was built in 1960, making it 65 years old in 2025.

What condition is Seneca Drive over Beaver Run Branch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does Seneca Drive over Beaver Run Branch carry?

About 1,985 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Seneca Drive over Beaver Run Branch?

The structure is 34 ft (10.5 m) long with a longest span of 33 ft (10.1 m) and a deck 33 ft wide.

Who owns Seneca Drive over Beaver Run Branch?

It is owned by the County Highway Agency.