US Bridges

Arkansas HWY 177 over Norfork Dam Spillway

Fair

Baxter County, Arkansas · 13 MI SE of Mountain Home · Structure no. AHTD000000M3875

Built
1944
81 years old, rebuilt 2008
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
576 ft
12 main spans
Daily traffic
2,800
2020 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Arkansas HWY 177 over Norfork Dam Spillway is a concrete slab carrying Arkansas HWY 177 over Norfork Dam Spillway in Baxter County, Arkansas. It was built in 1944 and reconstructed in 2008, so it is 81 years old, older than the Arkansas average of 45.1 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 2,860 by 2040. The structure is 576 ft (175.5 m) long and 42 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesArkansas HWY 177
CrossesNorfork Dam Spillway
Location13 MI SE of Mountain Home
RouteState Highway 177
CountyBaxter County
StateArkansas
Coordinates36.24833, -92.23778
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.3 US tons
Inventory rating38.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length576 ft (175.5 m)
Longest span48 ft (14.5 m)
Deck width42 ft (12.8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2020)
Projected traffic2,860 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed32.9 mi (53 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$825,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Arkansas HWY 177 over Norfork Dam Spillway built?

It was built in 1944, making it 81 years old in 2025. It was reconstructed in 2008.

What condition is Arkansas HWY 177 over Norfork Dam Spillway 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 August 2023.

How much traffic does Arkansas HWY 177 over Norfork Dam Spillway carry?

About 2,800 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Arkansas HWY 177 over Norfork Dam Spillway?

The structure is 576 ft (175.5 m) long with a longest span of 48 ft (14.5 m) and a deck 42 ft wide.

Who owns Arkansas HWY 177 over Norfork Dam Spillway?

It is owned by the Corps of Engineers (Civil).