US Bridges

Shingle Mill Road over Rock Brook

Good

Litchfield County, Connecticut · 1.5 Mile South of Route 4 · Structure no. 05053

Built
2019
6 years old
Condition
Good
inspected October 2024
Type
Arch - Deck
Concrete
Length
52 ft
1 main span
Daily traffic
64
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Shingle Mill Road over Rock Brook is a concrete arch - deck carrying Shingle Mill Road over Rock Brook in Litchfield County, Connecticut. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 64 vehicles a day, roughly 7% of them trucks, projected to reach 95 by 2044. The structure is 52 ft (15.9 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesShingle Mill Road
CrossesRock Brook
Location1.5 Mile South of Route 4
RouteCity Street 0
Coordinates41.75351, -73.04859
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length52 ft (15.9 m)
Longest span49 ft (14.9 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2024)
Projected traffic95 by 2044
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Shingle Mill Road over Rock Brook built?

It was built in 2019, making it 6 years old in 2025.

What condition is Shingle Mill Road over Rock Brook 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 October 2024.

How much traffic does Shingle Mill Road over Rock Brook carry?

About 64 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Shingle Mill Road over Rock Brook?

The structure is 52 ft (15.9 m) long with a longest span of 49 ft (14.9 m) and a deck 24 ft wide.

Who owns Shingle Mill Road over Rock Brook?

It is owned by the Town or Township Highway Agency.