US Bridges

Johnson Road over Hyalite Creek 125

Good

Gallatin County, Montana · 6M SW Bozeman · Structure no. L16745002+07001

Built
2014
11 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Johnson Road over Hyalite Creek 125 is a steel stringer/multi-beam or girder carrying Johnson Road over Hyalite Creek 125 in Gallatin County, Montana. It was built in 2014, so it is 11 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 34 ft (10.4 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesJohnson Road
CrossesHyalite Creek 125
Location6M SW Bozeman
RouteCounty Highway 745
StateMontana
Coordinates45.61292, -111.10997
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span33 ft (10.1 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.4 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 closed3.1 mi (5 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 Johnson Road over Hyalite Creek 125 built?

It was built in 2014, making it 11 years old in 2025.

What condition is Johnson Road over Hyalite Creek 125 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does Johnson Road over Hyalite Creek 125 carry?

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

How long is Johnson Road over Hyalite Creek 125?

The structure is 34 ft (10.4 m) long with a longest span of 33 ft (10.1 m) and a deck 25 ft wide.

Who owns Johnson Road over Hyalite Creek 125?

It is owned by the County Highway Agency.