US Bridges

Mariendahl Road over Turpentine Run

Good

St. Thomas Island, U.S. Virgin Islands · HWY 30 · Structure no. STT007

Built
1985
40 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
500
2019 count
Owner
State
State Highway Agency

About this bridge

Mariendahl Road over Turpentine Run is a concrete culvert carrying Mariendahl Road over Turpentine Run in St. Thomas Island, U.S. Virgin Islands. It was built in 1985, so it is 40 years old, younger than the U.S. Virgin Islands average of 51.6 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 500 vehicles a day, projected to reach 600 by 2029. The structure is 25 ft (7.7 m) long and 35 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesMariendahl Road
CrossesTurpentine Run
LocationHWY 30
RouteState Highway 0
CountySt. Thomas Island
StateU.S. Virgin Islands
Coordinates18.32883, -64.88292
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length25 ft (7.7 m)
Longest span12 ft (3.7 m)
Deck width35 ft (10.7 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2019)
Projected traffic600 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$68,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mariendahl Road over Turpentine Run built?

It was built in 1985, making it 40 years old in 2025.

What condition is Mariendahl Road over Turpentine Run 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 Mariendahl Road over Turpentine Run carry?

About 500 vehicles per day (2019 count).

How long is Mariendahl Road over Turpentine Run?

The structure is 25 ft (7.7 m) long with a longest span of 12 ft (3.7 m) and a deck 35 ft wide.

Who owns Mariendahl Road over Turpentine Run?

It is owned by the State Highway Agency.