US Bridges

Sunnyside DR over Ashley Creek 100

Fair

Flathead County, Montana · 1M SW Kalispell · Structure no. L15607000+01001

Built
1988
37 years old
Condition
Fair
inspected November 2023
Type
Channel Beam
Prestressed Concrete
Length
59 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Sunnyside DR over Ashley Creek 100 is a prestressed concrete channel beam carrying Sunnyside DR over Ashley Creek 100 in Flathead County, Montana. It was built in 1988, so it is 37 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 59 ft (18 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSunnyside DR
CrossesAshley Creek 100
Location1M SW Kalispell
RouteCounty Highway 15607
StateMontana
Coordinates48.18232, -114.32263
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.3 US tons
Inventory rating27.9 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length59 ft (18 m)
Longest span58 ft (17.7 m)
Deck width36 ft (11 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
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

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 Sunnyside DR over Ashley Creek 100 built?

It was built in 1988, making it 37 years old in 2025.

What condition is Sunnyside DR over Ashley Creek 100 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 Sunnyside DR over Ashley Creek 100 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Sunnyside DR over Ashley Creek 100?

The structure is 59 ft (18 m) long with a longest span of 58 ft (17.7 m) and a deck 36 ft wide.

Who owns Sunnyside DR over Ashley Creek 100?

It is owned by the County Highway Agency.