US Bridges

Twinstream Drive over Trib to Bonnie Br

Good

Howard County, Maryland · 75 W of Bonnie Branch RD · Structure no. 200000HO0273010

Built
2000
25 years old
Condition
Good
inspected February 2024
Type
Arch - Deck
Steel
Length
24 ft
1 main span
Daily traffic
27
2024 count
Owner
County
County Highway Agency

About this bridge

Twinstream Drive over Trib to Bonnie Br is a steel arch - deck carrying Twinstream Drive over Trib to Bonnie Br in Howard County, Maryland. It was built in 2000, so it is 25 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 27 vehicles a day, projected to reach 40 by 2044. The structure is 24 ft (7.3 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTwinstream Drive
CrossesTrib to Bonnie Br
Location75 W of Bonnie Branch RD
RouteCounty Highway 0
CountyHoward County
StateMaryland
Coordinates39.237, -76.78231
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.5 US tons
Inventory rating42 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2024)
Projected traffic40 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Twinstream Drive over Trib to Bonnie Br built?

It was built in 2000, making it 25 years old in 2025.

What condition is Twinstream Drive over Trib to Bonnie Br in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does Twinstream Drive over Trib to Bonnie Br carry?

About 27 vehicles per day (2024 count).

How long is Twinstream Drive over Trib to Bonnie Br?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 30 ft wide.

Who owns Twinstream Drive over Trib to Bonnie Br?

It is owned by the County Highway Agency.