US Bridges

Mcdonald LN over Ltl Prickly Pear Crk 151

FairPosted for load

Lewis and Clark County, Montana · 3M W Canyon Creek · Structure no. L25995000+02001

Built
1990
35 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Mcdonald LN over Ltl Prickly Pear Crk 151 is a steel stringer/multi-beam or girder carrying Mcdonald LN over Ltl Prickly Pear Crk 151 in Lewis and Clark County, Montana. It was built in 1990, so it is 35 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. 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 39 ft (11.9 m) long and 13 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMcdonald LN
CrossesLtl Prickly Pear Crk 151
Location3M W Canyon Creek
RouteCounty Highway 25995
CountyLewis and Clark County
StateMontana
Coordinates46.81005, -112.30846
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating5 US tons
Inventory rating5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span32 ft (9.8 m)
Deck width13 ft (4 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Mcdonald LN over Ltl Prickly Pear Crk 151 built?

It was built in 1990, making it 35 years old in 2025.

What condition is Mcdonald LN over Ltl Prickly Pear Crk 151 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 June 2024.

How much traffic does Mcdonald LN over Ltl Prickly Pear Crk 151 carry?

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

How long is Mcdonald LN over Ltl Prickly Pear Crk 151?

The structure is 39 ft (11.9 m) long with a longest span of 32 ft (9.8 m) and a deck 13 ft wide.

Who owns Mcdonald LN over Ltl Prickly Pear Crk 151?

It is owned by the County Highway Agency.