US Bridges

IRR Duncan Pond RD over South Branch

Good

Somerset County, Maine · 23KM North of Jackman · Structure no. 00000000000S555

Built
1990
35 years old, rebuilt 2020
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
25
2018 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR Duncan Pond RD over South Branch is a steel stringer/multi-beam or girder carrying IRR Duncan Pond RD over South Branch in Somerset County, Maine. It was built in 1990 and reconstructed in 2020, so it is 35 years old, younger than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: open, posting recommended but not legally implemented.

It carries about 25 vehicles a day, roughly 50% of them trucks, projected to reach 30 by 2044. The structure is 65 ft (19.9 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesIRR Duncan Pond RD
CrossesSouth Branch
Location23KM North of Jackman
RouteFederal Lands Road 1591
StateMaine
Coordinates45.82719, -70.28781
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18.8 US tons
Inventory rating14.2 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length65 ft (19.9 m)
Longest span59 ft (17.9 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2018)
Projected traffic30 by 2044
Trucks50%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR Duncan Pond RD over South Branch built?

It was built in 1990, making it 35 years old in 2025. It was reconstructed in 2020.

What condition is IRR Duncan Pond RD over South Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does IRR Duncan Pond RD over South Branch carry?

About 25 vehicles per day (2018 count), of which roughly 50% are trucks.

How long is IRR Duncan Pond RD over South Branch?

The structure is 65 ft (19.9 m) long with a longest span of 59 ft (17.9 m) and a deck 16 ft wide.

Who owns IRR Duncan Pond RD over South Branch?

It is owned by the Bureau of Indian Affairs.