US Bridges

US-70/SEC19/L21.57 over Blackfish Lake

Fair

St. Francis County, Arkansas · 3.45 MI SW Crittenden CO · Structure no. 000000000001377

Built
1930
95 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete
Length
470 ft
5 main spans
Daily traffic
2,010
2018 count
Owner
State
State Highway Agency

About this bridge

US-70/SEC19/L21.57 over Blackfish Lake is a concrete tee beam carrying US-70/SEC19/L21.57 over Blackfish Lake in St. Francis County, Arkansas. It was built in 1930, so it is 95 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 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 2,010 vehicles a day, roughly 18% of them trucks, projected to reach 1,331 by 2028. The structure is 470 ft (143.3 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS-70/SEC19/L21.57
CrossesBlackfish Lake
Location3.45 MI SW Crittenden CO
RouteU.S. Route 70
CountySt. Francis County
StateArkansas
Coordinates35.13076, -90.45654
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5 (+5 approach)
Design loadH 15
Structure length470 ft (143.3 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,010 (2018)
Projected traffic1,331 by 2028
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US-70/SEC19/L21.57 over Blackfish Lake built?

It was built in 1930, making it 95 years old in 2025.

What condition is US-70/SEC19/L21.57 over Blackfish Lake 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 March 2024.

How much traffic does US-70/SEC19/L21.57 over Blackfish Lake carry?

About 2,010 vehicles per day (2018 count), of which roughly 18% are trucks.

How long is US-70/SEC19/L21.57 over Blackfish Lake?

The structure is 470 ft (143.3 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns US-70/SEC19/L21.57 over Blackfish Lake?

It is owned by the State Highway Agency.