US Bridges

Mount RD over Sebasticook River

Fair

Waldo County, Maine · 0.6 MI E of RTE 11 & 100 · Structure no. 6209

Built
1973
52 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
241 ft
3 main spans
Daily traffic
290
2016 count
Owner
State
State Highway Agency

About this bridge

Mount RD over Sebasticook River is a steel continuous stringer/multi-beam or girder carrying Mount RD over Sebasticook River in Waldo County, Maine. It was built in 1973, so it is 52 years old, younger 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 290 vehicles a day, roughly 5% of them trucks, projected to reach 464 by 2036. The structure is 241 ft (73.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMount RD
CrossesSebasticook River
Location0.6 MI E of RTE 11 & 100
RouteCity Street 0
CountyWaldo County
StateMaine
Coordinates44.74715, -69.39067
Functional classRural Local

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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length241 ft (73.5 m)
Longest span93 ft (28.4 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2016)
Projected traffic464 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Mount RD over Sebasticook River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Mount RD over Sebasticook 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 June 2024.

How much traffic does Mount RD over Sebasticook River carry?

About 290 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mount RD over Sebasticook River?

The structure is 241 ft (73.5 m) long with a longest span of 93 ft (28.4 m) and a deck 31 ft wide.

Who owns Mount RD over Sebasticook River?

It is owned by the State Highway Agency.