US Bridges

Mill ST over Mousam River

Fair

York County, Maine · 0.3 MI N of JCT RTE 99 · Structure no. 5756

Built
1961
64 years old, rebuilt 2024
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
79 ft
1 main span
Daily traffic
3,458
2016 count
Owner
State
State Highway Agency

About this bridge

Mill ST over Mousam River is a steel stringer/multi-beam or girder carrying Mill ST over Mousam River in York County, Maine. It was built in 1961 and reconstructed in 2024, so it is 64 years old, older than the Maine average of 53.7 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 3,458 vehicles a day, roughly 5% of them trucks, projected to reach 4,841 by 2036. The structure is 79 ft (24 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesMill ST
CrossesMousam River
Location0.3 MI N of JCT RTE 99
RouteCounty Highway 0
CountyYork County
StateMaine
Coordinates43.40376, -70.58605
Functional classRural Minor 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
Deck8 Very GoodNo problems noted.
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 protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.2 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length79 ft (24 m)
Longest span73 ft (22.4 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,458 (2016)
Projected traffic4,841 by 2036
Trucks5%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 ST over Mousam River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2024.

What condition is Mill ST over Mousam 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 January 2025.

How much traffic does Mill ST over Mousam River carry?

About 3,458 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mill ST over Mousam River?

The structure is 79 ft (24 m) long with a longest span of 73 ft (22.4 m) and a deck 31 ft wide.

Who owns Mill ST over Mousam River?

It is owned by the State Highway Agency.