US Bridges

Nfa 1521 (sa 2717) over Cool Springs Branch

FairPosted for load

Gibson County, Tennessee · 2.7 MI E JCT SR105&DYER · Structure no. 27015210001

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Channel Beam
Concrete
Length
57 ft
3 main spans
Daily traffic
264
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 1521 (sa 2717) over Cool Springs Branch is a concrete channel beam carrying Nfa 1521 (sa 2717) over Cool Springs Branch in Gibson County, Tennessee. It was built in 1960, so it is 65 years old, older than the Tennessee average of 47.4 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. Its operating status is: posted for load restriction.

It carries about 264 vehicles a day, roughly 3% of them trucks, projected to reach 450 by 2041. The structure is 57 ft (17.4 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNfa 1521 (sa 2717)
CrossesCool Springs Branch
Location2.7 MI E JCT SR105&DYER
RouteCounty Highway 1521
CountyGibson County
StateTennessee
Coordinates36.15333, -89.11166
Functional classRural Minor 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.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating15.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic264 (2021)
Projected traffic450 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$391,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 1521 (sa 2717) over Cool Springs Branch built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nfa 1521 (sa 2717) over Cool Springs Branch 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 July 2023.

How much traffic does Nfa 1521 (sa 2717) over Cool Springs Branch carry?

About 264 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 1521 (sa 2717) over Cool Springs Branch?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Nfa 1521 (sa 2717) over Cool Springs Branch?

It is owned by the County Highway Agency.