US Bridges

Mountain RD over Blackstone Brook

Poor

Piscataquis County, Maine · 2.2 MI W Shrly/Abbot RD · Structure no. 0941

Built
2021
4 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
10
2016 count
Owner
County
County Highway Agency

About this bridge

Mountain RD over Blackstone Brook is a steel stringer/multi-beam or girder carrying Mountain RD over Blackstone Brook in Piscataquis County, Maine. It was built in 2021, so it is 4 years old, younger 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.

It carries about 10 vehicles a day, roughly 5% of them trucks, projected to reach 16 by 2036. The structure is 36 ft (11 m) long and 17 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesMountain RD
CrossesBlackstone Brook
Location2.2 MI W Shrly/Abbot RD
RouteCity Street 0
CountyPiscataquis County
StateMaine
Coordinates45.25143, -69.62158
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.5 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadGreater than HL 93
Structure length36 ft (11 m)
Longest span33 ft (10.1 m)
Deck width17 ft (5.2 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2016)
Projected traffic16 by 2036
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
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 Mountain RD over Blackstone Brook built?

It was built in 2021, making it 4 years old in 2025.

What condition is Mountain RD over Blackstone Brook 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 November 2024.

How much traffic does Mountain RD over Blackstone Brook carry?

About 10 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Mountain RD over Blackstone Brook?

The structure is 36 ft (11 m) long with a longest span of 33 ft (10.1 m) and a deck 17 ft wide.

Who owns Mountain RD over Blackstone Brook?

It is owned by the County Highway Agency.