US Bridges

ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky

Fair

Middlesex County, Massachusetts · .3 MI E of ST RTE 38 · Structure no. M120194DYDOTNBI

Built
1988
37 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
308 ft
3 main spans
Daily traffic
41,250
2024 count
Owner
State
State Highway Agency

About this bridge

ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky is a steel continuous stringer/multi-beam or girder carrying ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky in Middlesex County, Massachusetts. It was built in 1988, so it is 37 years old, younger than the Massachusetts average of 63.8 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 41,250 vehicles a day, roughly 8% of them trucks, projected to reach 116,868 by 2031. The structure is 308 ft (93.8 m) long and 109 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesST 16 Myst Val Pky
CrossesComb Mystic R & Ped/Bky
Location.3 MI E of ST RTE 38
RouteState Highway 16
Coordinates42.4059, -71.09642
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating45 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length308 ft (93.8 m)
Longest span140 ft (42.7 m)
Deck width109 ft (33.1 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,250 (2024)
Projected traffic116,868 by 2031
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$30.6 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky built?

It was built in 1988, making it 37 years old in 2025.

What condition is ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky 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 October 2024.

How much traffic does ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky carry?

About 41,250 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky?

The structure is 308 ft (93.8 m) long with a longest span of 140 ft (42.7 m) and a deck 109 ft wide.

Who owns ST 16 Myst Val Pky over Comb Mystic R & Ped/Bky?

It is owned by the State Highway Agency.