US Bridges

Stc 1764; Park St. over Portneuf River

Fair

Bannock County, Idaho · At Inkom Scl · Structure no. 000000000021910

Built
1940
85 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
44 ft
1 main span
Daily traffic
1,100
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Stc 1764; Park St. over Portneuf River is a concrete stringer/multi-beam or girder carrying Stc 1764; Park St. over Portneuf River in Bannock County, Idaho. It was built in 1940, so it is 85 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 5 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 1,100 vehicles a day, roughly 3% of them trucks, projected to reach 1,650 by 2042. The structure is 44 ft (13.4 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesStc 1764; Park St.
CrossesPortneuf River
LocationAt Inkom Scl
RouteCity Street 1764
CountyBannock County
StateIdaho
Coordinates42.79164, -112.25192
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width26 ft (7.8 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,650 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$810,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 1764; Park St. over Portneuf River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Stc 1764; Park St. over Portneuf River 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 October 2024.

How much traffic does Stc 1764; Park St. over Portneuf River carry?

About 1,100 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Stc 1764; Park St. over Portneuf River?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 26 ft wide.

Who owns Stc 1764; Park St. over Portneuf River?

It is owned by the City or Municipal Highway Agency.