US Bridges

E Riggs ST over Prickly Pear Creek 083

Good

Lewis and Clark County, Montana · East Helena-E Riggs ST · Structure no. M25037000+00201

Built
1982
43 years old
Condition
Good
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
316
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

E Riggs ST over Prickly Pear Creek 083 is a prestressed concrete tee beam carrying E Riggs ST over Prickly Pear Creek 083 in Lewis and Clark County, Montana. It was built in 1982, so it is 43 years old, younger than the Montana average of 47 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.

It carries about 316 vehicles a day, roughly 3% of them trucks, projected to reach 337 by 2043. The structure is 57 ft (17.4 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesE Riggs ST
CrossesPrickly Pear Creek 083
LocationEast Helena-E Riggs ST
RouteCity Street 25037
StateMontana
Coordinates46.59036, -111.92109
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span55 ft (16.8 m)
Deck width42 ft (12.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic316 (2023)
Projected traffic337 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 E Riggs ST over Prickly Pear Creek 083 built?

It was built in 1982, making it 43 years old in 2025.

What condition is E Riggs ST over Prickly Pear Creek 083 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 March 2023.

How much traffic does E Riggs ST over Prickly Pear Creek 083 carry?

About 316 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is E Riggs ST over Prickly Pear Creek 083?

The structure is 57 ft (17.4 m) long with a longest span of 55 ft (16.8 m) and a deck 42 ft wide.

Who owns E Riggs ST over Prickly Pear Creek 083?

It is owned by the City or Municipal Highway Agency.