US Bridges

Mariomi Road over Silvermine River

Good

Fairfield County, Connecticut · 300 East of Valley Road · Structure no. 04999

Built
2013
12 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete
Length
45 ft
2 main spans
Daily traffic
800
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mariomi Road over Silvermine River is a concrete culvert carrying Mariomi Road over Silvermine River in Fairfield County, Connecticut. It was built in 2013, so it is 12 years old, younger than the Connecticut average of 56.7 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 800 vehicles a day, roughly 7% of them trucks, projected to reach 1,189 by 2043. The structure is 45 ft (13.7 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesMariomi Road
CrossesSilvermine River
Location300 East of Valley Road
RouteCity Street 0
Coordinates41.17366, -73.47807
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length45 ft (13.7 m)
Longest span21 ft (6.4 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic1,189 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Mariomi Road over Silvermine River built?

It was built in 2013, making it 12 years old in 2025.

What condition is Mariomi Road over Silvermine River 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 2023.

How much traffic does Mariomi Road over Silvermine River carry?

About 800 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Mariomi Road over Silvermine River?

The structure is 45 ft (13.7 m) long with a longest span of 21 ft (6.4 m) and a deck 31 ft wide.

Who owns Mariomi Road over Silvermine River?

It is owned by the Town or Township Highway Agency.