US Bridges

County Road 323 over Snake Creek 048

FairPosted for load

Blaine County, Montana · 9M S Zurich · Structure no. L03323006+08001

Built
1911
114 years old
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
72 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

County Road 323 over Snake Creek 048 is a steel truss - thru carrying County Road 323 over Snake Creek 048 in Blaine County, Montana. It was built in 1911, so it is 114 years old, older 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 72 ft (21.9 m) long and 18 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesCounty Road 323
CrossesSnake Creek 048
Location9M S Zurich
RouteCounty Highway 3323
CountyBlaine County
StateMontana
Coordinates48.46436, -109.06375
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
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 protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating14 US tons
Inventory rating11 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span72 ft (21.9 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.3 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
CrossesWaterway
Detour if closed14.3 mi (23 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$213,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 323 over Snake Creek 048 built?

It was built in 1911, making it 114 years old in 2025.

What condition is County Road 323 over Snake Creek 048 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 County Road 323 over Snake Creek 048 carry?

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

How long is County Road 323 over Snake Creek 048?

The structure is 72 ft (21.9 m) long with a longest span of 72 ft (21.9 m) and a deck 18 ft wide.

Who owns County Road 323 over Snake Creek 048?

It is owned by the County Highway Agency.