US Bridges

Conrad RD over Stillwater River

Fair

Flathead County, Montana · 1M E Kalispell · Structure no. S00317003+00001

Built
1980
45 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
219 ft
2 main spans
Daily traffic
6,375
2023 count
Owner
State
State Highway Agency

About this bridge

Conrad RD over Stillwater River is a prestressed concrete stringer/multi-beam or girder carrying Conrad RD over Stillwater River in Flathead County, Montana. It was built in 1980, so it is 45 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 5 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 6,375 vehicles a day, roughly 3% of them trucks, projected to reach 6,789 by 2043. The structure is 219 ft (66.7 m) long and 38 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesConrad RD
CrossesStillwater River
Location1M E Kalispell
RouteState Highway 6734
CountyFlathead County
StateMontana
Coordinates48.204, -114.28211
Functional classUrban Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating16 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length219 ft (66.7 m)
Longest span109 ft (33.2 m)
Deck width38 ft (11.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,375 (2023)
Projected traffic6,789 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Conrad RD over Stillwater River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Conrad RD over Stillwater River 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 November 2023.

How much traffic does Conrad RD over Stillwater River carry?

About 6,375 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Conrad RD over Stillwater River?

The structure is 219 ft (66.7 m) long with a longest span of 109 ft (33.2 m) and a deck 38 ft wide.

Who owns Conrad RD over Stillwater River?

It is owned by the State Highway Agency.