US Bridges

Cedar ST over Int Cedar St-I 15

Fair

Lewis and Clark County, Montana · Helena-Cedar ST · Structure no. U05807001+08231

Built
2002
23 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
197 ft
2 main spans
Daily traffic
14,368
2023 count
Owner
State
State Highway Agency

About this bridge

Cedar ST over Int Cedar St-I 15 is a steel continuous stringer/multi-beam or girder carrying Cedar ST over Int Cedar St-I 15 in Lewis and Clark County, Montana. It was built in 2002, so it is 23 years old, younger than the Montana average of 47 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 14,368 vehicles a day, roughly 2% of them trucks, projected to reach 15,086 by 2043. The structure is 197 ft (60 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCedar ST
CrossesInt Cedar St-I 15
LocationHelena-Cedar ST
RouteCity Street 127
CountyLewis and Clark County
StateMontana
Coordinates46.60684, -112.00808
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length197 ft (60 m)
Longest span98 ft (30 m)
Deck width68 ft (20.7 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,368 (2023)
Projected traffic15,086 by 2043
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cedar ST over Int Cedar St-I 15 built?

It was built in 2002, making it 23 years old in 2025.

What condition is Cedar ST over Int Cedar St-I 15 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 August 2023.

How much traffic does Cedar ST over Int Cedar St-I 15 carry?

About 14,368 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Cedar ST over Int Cedar St-I 15?

The structure is 197 ft (60 m) long with a longest span of 98 ft (30 m) and a deck 68 ft wide.

Who owns Cedar ST over Int Cedar St-I 15?

It is owned by the State Highway Agency.