US Bridges

Tamar Drive over Unnamed Stream

Poor

Howard County, Maryland · 0.1 MI E Phelps Luck · Structure no. 200000HO0109010

Built
1970
55 years old
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
10,941
1999 count
Owner
County
County Highway Agency

About this bridge

Tamar Drive over Unnamed Stream is a steel stringer/multi-beam or girder carrying Tamar Drive over Unnamed Stream in Howard County, Maryland. It was built in 1970, so it is 55 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 10,941 vehicles a day, roughly 4% of them trucks, projected to reach 16,000 by 2015. The structure is 54 ft (16.4 m) long and 58 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesTamar Drive
CrossesUnnamed Stream
Location0.1 MI E Phelps Luck
RouteCounty Highway 991
CountyHoward County
StateMaryland
Coordinates39.2133, -76.8207
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating67 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length54 ft (16.4 m)
Longest span52 ft (15.9 m)
Deck width58 ft (17.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,941 (1999)
Projected traffic16,000 by 2015
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Unnamed Stream built?

It was built in 1970, making it 55 years old in 2025.

What condition is Tamar Drive over Unnamed Stream 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 March 2023.

How much traffic does Tamar Drive over Unnamed Stream carry?

About 10,941 vehicles per day (1999 count), of which roughly 4% are trucks.

How long is Tamar Drive over Unnamed Stream?

The structure is 54 ft (16.4 m) long with a longest span of 52 ft (15.9 m) and a deck 58 ft wide.

Who owns Tamar Drive over Unnamed Stream?

It is owned by the County Highway Agency.