US Bridges

US Route 1 over Mystic River

Fair

New London County, Connecticut · .5 Miles East of SR 614 · Structure no. 00362

Built
1922
103 years old, rebuilt 2002
Condition
Fair
inspected May 2023
Type
Movable - Bascule
Steel
Length
220 ft
1 main span
Daily traffic
11,000
2017 count
Owner
State
State Highway Agency

About this bridge

US Route 1 over Mystic River is a steel movable - bascule carrying US Route 1 over Mystic River in New London County, Connecticut. It was built in 1922 and reconstructed in 2002, so it is 103 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 11,000 vehicles a day, roughly 6% of them trucks, projected to reach 16,345 by 2037. The structure is 220 ft (67.1 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS Route 1
CrossesMystic River
Location.5 Miles East of SR 614
RouteU.S. Route 1
Coordinates41.35471, -71.96874
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+3 approach)
Design loadUnknown
Structure length220 ft (67.1 m)
Longest span85 ft (25.9 m)
Deck width34 ft (10.5 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deck13 ft (4 m)

Traffic and service

Average daily traffic11,000 (2017)
Projected traffic16,345 by 2037
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US Route 1 over Mystic River built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 2002.

What condition is US Route 1 over Mystic River 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 May 2023.

How much traffic does US Route 1 over Mystic River carry?

About 11,000 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is US Route 1 over Mystic River?

The structure is 220 ft (67.1 m) long with a longest span of 85 ft (25.9 m) and a deck 34 ft wide.

Who owns US Route 1 over Mystic River?

It is owned by the State Highway Agency.