US Bridges

SMA7344;BRYDEN Cyn over Snake R;high/Southway Br

Fair

Nez Perce County, Idaho · In Lewiston;bryden Ext · Structure no. 000000000021495

Built
1982
43 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
1,866 ft
5 main spans
Daily traffic
22,000
2023 count
Owner
County
County Highway Agency

About this bridge

SMA7344;BRYDEN Cyn over Snake R;high/Southway Br is a prestressed concrete continuous box beam or girders - single or spread carrying SMA7344;BRYDEN Cyn over Snake R;high/Southway Br in Nez Perce County, Idaho. It was built in 1982, so it is 43 years old, younger 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 22,000 vehicles a day, roughly 7% of them trucks, projected to reach 33,000 by 2042. The structure is 1,866 ft (568.8 m) long and 70 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSMA7344;BRYDEN Cyn
CrossesSnake R;high/Southway Br
LocationIn Lewiston;bryden Ext
RouteCity Street 7344
CountyNez Perce County
StateIdaho
Coordinates46.39667, -117.04322
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length1,866 ft (568.8 m)
Longest span610 ft (185.9 m)
Deck width70 ft (21.3 m)
Roadway width54 ft (16.4 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic22,000 (2023)
Projected traffic33,000 by 2042
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$28.6 million (2018 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SMA7344;BRYDEN Cyn over Snake R;high/Southway Br built?

It was built in 1982, making it 43 years old in 2025.

What condition is SMA7344;BRYDEN Cyn over Snake R;high/Southway Br 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 May 2024.

How much traffic does SMA7344;BRYDEN Cyn over Snake R;high/Southway Br carry?

About 22,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SMA7344;BRYDEN Cyn over Snake R;high/Southway Br?

The structure is 1,866 ft (568.8 m) long with a longest span of 610 ft (185.9 m) and a deck 70 ft wide.

Who owns SMA7344;BRYDEN Cyn over Snake R;high/Southway Br?

It is owned by the County Highway Agency.