US Bridges

Murphy Road over Waldvogel Canal

Fair

Ada County, Idaho · 2.5 S. 3.0 W. Kuna · Structure no. 000000000025830

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Murphy Road over Waldvogel Canal is a steel stringer/multi-beam or girder carrying Murphy Road over Waldvogel Canal in Ada County, Idaho. It was built in 1971, so it is 54 years old, older than the Idaho average of 45.3 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.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 44 ft (13.4 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesMurphy Road
CrossesWaldvogel Canal
Location2.5 S. 3.0 W. Kuna
RouteCounty Highway 0
CountyAda County
StateIdaho
Coordinates43.45561, -116.48133
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+1 approach)
Design loadH 20
Structure length44 ft (13.4 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.1 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Murphy Road over Waldvogel Canal built?

It was built in 1971, making it 54 years old in 2025.

What condition is Murphy Road over Waldvogel Canal 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 Murphy Road over Waldvogel Canal carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Murphy Road over Waldvogel Canal?

The structure is 44 ft (13.4 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns Murphy Road over Waldvogel Canal?

It is owned by the County Highway Agency.