US Bridges

Tamar Drive over Dorsey Run

Fair

Howard County, Maryland · 0.1 MI W of Old Mongomer · Structure no. 200000HO0143030

Built
1989
36 years old
Condition
Fair
inspected March 2023
Type
Culvert
Steel
Length
34 ft
3 main spans
Daily traffic
11,824
1999 count
Owner
County
County Highway Agency

About this bridge

Tamar Drive over Dorsey Run is a steel culvert carrying Tamar Drive over Dorsey Run in Howard County, Maryland. It was built in 1989, so it is 36 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 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 11,824 vehicles a day, roughly 8% of them trucks, projected to reach 11,000 by 2011. The structure is 34 ft (10.5 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesTamar Drive
CrossesDorsey Run
Location0.1 MI W of Old Mongomer
RouteCounty Highway 0
CountyHoward County
StateMaryland
Coordinates39.20265, -76.80156
Functional classRural Minor 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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: 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 rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadUnknown
Structure length34 ft (10.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck12 ft (3.7 m)

Traffic and service

Average daily traffic11,824 (1999)
Projected traffic11,000 by 2011
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 Tamar Drive over Dorsey Run built?

It was built in 1989, making it 36 years old in 2025.

What condition is Tamar Drive over Dorsey 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 March 2023.

How much traffic does Tamar Drive over Dorsey Run carry?

About 11,824 vehicles per day (1999 count), of which roughly 8% are trucks.

How long is Tamar Drive over Dorsey Run?

The structure is 34 ft (10.5 m) long with a longest span of 12 ft (3.7 m).

Who owns Tamar Drive over Dorsey Run?

It is owned by the County Highway Agency.