US Bridges

Route 318 over Saville Dam Spillway

Fair

Litchfield County, Connecticut · 0.6 Mile West of Rte. 219 · Structure no. 01591

Built
1940
85 years old
Condition
Fair
inspected November 2023
Type
Arch - Deck
Concrete
Length
34 ft
1 main span
Daily traffic
5,300
2021 count
Owner
Private
Private (other than railroad)

About this bridge

Route 318 over Saville Dam Spillway is a concrete arch - deck carrying Route 318 over Saville Dam Spillway in Litchfield County, Connecticut. It was built in 1940, so it is 85 years old, older than the Connecticut average of 56.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,300 vehicles a day, roughly 3% of them trucks, projected to reach 7,875 by 2041. The structure is 34 ft (10.5 m) long and 54 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesRoute 318
CrossesSaville Dam Spillway
Location0.6 Mile West of Rte. 219
RouteState Highway 318
CountyLitchfield County
StateConnecticut
Coordinates41.91137, -72.95758
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length34 ft (10.5 m)
Longest span34 ft (10.5 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,300 (2021)
Projected traffic7,875 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 318 over Saville Dam Spillway built?

It was built in 1940, making it 85 years old in 2025.

What condition is Route 318 over Saville Dam Spillway in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does Route 318 over Saville Dam Spillway carry?

About 5,300 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Route 318 over Saville Dam Spillway?

The structure is 34 ft (10.5 m) long with a longest span of 34 ft (10.5 m) and a deck 54 ft wide.

Who owns Route 318 over Saville Dam Spillway?

It is owned by the Private (other than railroad).