US Bridges

SR-51 (hal Adams) over Suwannee River

Fair

Lafayette County, Florida · 3 Mi. N. of Mayo · Structure no. 330009

Built
1947
78 years old
Condition
Fair
inspected October 2023
Type
Suspension
Steel
Length
687 ft
1 main span
Daily traffic
4,900
2022 count
Owner
State
State Highway Agency

About this bridge

SR-51 (hal Adams) over Suwannee River is a steel suspension carrying SR-51 (hal Adams) over Suwannee River in Lafayette County, Florida. It was built in 1947, so it is 78 years old, older than the Florida average of 41.3 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 4,900 vehicles a day, roughly 8% of them trucks, projected to reach 8,502 by 2044. The structure is 687 ft (209.4 m) long and 29 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSR-51 (hal Adams)
CrossesSuwannee River
Location3 Mi. N. of Mayo
RouteState Highway 51
CountyLafayette County
StateFlorida
Coordinates30.09924, -83.17175
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
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 rating35.6 US tons
Inventory rating21.2 US tons

Structure

Structure typeSuspension
MaterialSteel
DeckClosed grating
Main spans1 (+8 approach)
Design loadH 15
Structure length687 ft (209.4 m)
Longest span420 ft (128 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic4,900 (2022)
Projected traffic8,502 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR-51 (hal Adams) over Suwannee River built?

It was built in 1947, making it 78 years old in 2025.

What condition is SR-51 (hal Adams) over Suwannee 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 2023.

How much traffic does SR-51 (hal Adams) over Suwannee River carry?

About 4,900 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is SR-51 (hal Adams) over Suwannee River?

The structure is 687 ft (209.4 m) long with a longest span of 420 ft (128 m) and a deck 29 ft wide.

Who owns SR-51 (hal Adams) over Suwannee River?

It is owned by the State Highway Agency.