US Bridges

S 569 over Mill Creek 040

FairPosted for load

Deer Lodge County, Montana · 4M SE Anaconda · Structure no. L12001001+06001

Built
1950
75 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
27 ft
1 main span
Daily traffic
824
2023 count
Owner
County
County Highway Agency

About this bridge

S 569 over Mill Creek 040 is a wood or timber stringer/multi-beam or girder carrying S 569 over Mill Creek 040 in Deer Lodge County, Montana. It was built in 1950, so it is 75 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 6 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 824 vehicles a day, roughly 26% of them trucks, projected to reach 890 by 2043. The structure is 27 ft (8.2 m) long and 26 ft wide. If it were closed, the detour would be 72.7 mi (117 km).

CarriesS 569
CrossesMill Creek 040
Location4M SE Anaconda
RouteCounty Highway 569
StateMontana
Coordinates46.09779, -112.89018
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating30 US tons
Inventory rating19 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic824 (2023)
Projected traffic890 by 2043
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed72.7 mi (117 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 S 569 over Mill Creek 040 built?

It was built in 1950, making it 75 years old in 2025.

What condition is S 569 over Mill Creek 040 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 July 2023.

How much traffic does S 569 over Mill Creek 040 carry?

About 824 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is S 569 over Mill Creek 040?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns S 569 over Mill Creek 040?

It is owned by the County Highway Agency.