US Bridges

Blair RD over Riggs Brook

Fair

Kennebec County, Maine · 0.5 MI NE Rt 201 100 · Structure no. 0498

Built
1960
65 years old, rebuilt 2010
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
159
2016 count
Owner
State
State Highway Agency

About this bridge

Blair RD over Riggs Brook is a steel stringer/multi-beam or girder carrying Blair RD over Riggs Brook in Kennebec County, Maine. It was built in 1960 and reconstructed in 2010, so it is 65 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 6 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 159 vehicles a day, roughly 5% of them trucks, projected to reach 254 by 2036. The structure is 24 ft (7.3 m) long and 22 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesBlair RD
CrossesRiggs Brook
Location0.5 MI NE Rt 201 100
RouteCity Street 0
CountyKennebec County
StateMaine
Coordinates44.35014, -69.73725
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating106.8 US tons
Inventory rating71.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width22 ft (6.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic159 (2016)
Projected traffic254 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Blair RD over Riggs Brook built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2010.

What condition is Blair RD over Riggs Brook 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 Blair RD over Riggs Brook carry?

About 159 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Blair RD over Riggs Brook?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 22 ft wide.

Who owns Blair RD over Riggs Brook?

It is owned by the State Highway Agency.