US Bridges

Mill RD over Piscataqua River

PoorPosted for load

Cumberland County, Maine · 0.1 MI E Rt 100 · Structure no. 0358

Built
1960
65 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
80
2016 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mill RD over Piscataqua River is a steel stringer/multi-beam or girder carrying Mill RD over Piscataqua River in Cumberland County, Maine. It was built in 1960, so it is 65 years old, older than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 80 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2036. The structure is 39 ft (11.9 m) long and 17 ft wide.

CarriesMill RD
CrossesPiscataqua River
Location0.1 MI E Rt 100
RouteCity Street 0
StateMaine
Coordinates43.74448, -70.29686
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating28.9 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span34 ft (10.4 m)
Deck width17 ft (5.3 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2016)
Projected traffic128 by 2036
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill RD over Piscataqua River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Mill RD over Piscataqua River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Mill RD over Piscataqua River carry?

About 80 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mill RD over Piscataqua River?

The structure is 39 ft (11.9 m) long with a longest span of 34 ft (10.4 m) and a deck 17 ft wide.

Who owns Mill RD over Piscataqua River?

It is owned by the Town or Township Highway Agency.