US Bridges

Gilman RD over Casco Bay

Fair

Cumberland County, Maine · 1.6 MI S JCT RTE 88 · Structure no. 5635

Built
1955
70 years old, rebuilt 1992
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
2,001 ft
33 main spans
Daily traffic
2,240
2016 count
Owner
State
State Highway Agency

About this bridge

Gilman RD over Casco Bay is a steel stringer/multi-beam or girder carrying Gilman RD over Casco Bay in Cumberland County, Maine. It was built in 1955 and reconstructed in 1992, so it is 70 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 2,240 vehicles a day, roughly 5% of them trucks, projected to reach 3,136 by 2036. The structure is 2,001 ft (609.9 m) long and 27 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

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CarriesGilman RD
CrossesCasco Bay
Location1.6 MI S JCT RTE 88
RouteCounty Highway 0
CountyCumberland County
StateMaine
Coordinates43.77477, -70.14911
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans33
Design loadHS 20
Structure length2,001 ft (609.9 m)
Longest span60 ft (18.3 m)
Deck width27 ft (8.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,240 (2016)
Projected traffic3,136 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

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

Frequently asked questions

When was Gilman RD over Casco Bay built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1992.

What condition is Gilman RD over Casco Bay 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 2024.

How much traffic does Gilman RD over Casco Bay carry?

About 2,240 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Gilman RD over Casco Bay?

The structure is 2,001 ft (609.9 m) long with a longest span of 60 ft (18.3 m) and a deck 27 ft wide.

Who owns Gilman RD over Casco Bay?

It is owned by the State Highway Agency.