US Bridges

I10 SR8 over Blackwater River

Fair

Santa Rosa County, Florida · 4.0 Miles West of SR87 · Structure no. 580167

Built
1997
28 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
3,109 ft
16 main spans
Daily traffic
21,000
2022 count
Owner
State
State Highway Agency

About this bridge

I10 SR8 over Blackwater River is a steel continuous stringer/multi-beam or girder carrying I10 SR8 over Blackwater River in Santa Rosa County, Florida. It was built in 1997, so it is 28 years old, younger 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 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 21,000 vehicles a day, roughly 25% of them trucks, projected to reach 36,435 by 2044. The structure is 3,109 ft (947.6 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI10 SR8
CrossesBlackwater River
Location4.0 Miles West of SR87
RouteInterstate 10
CountySanta Rosa County
StateFlorida
Coordinates30.58465, -87.01294
Functional classRural Principal Arterial - Interstate

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.6 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans16 (+6 approach)
Design loadHS 20 + Mod
Structure length3,109 ft (947.6 m)
Longest span220 ft (67.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,000 (2022)
Projected traffic36,435 by 2044
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I10 SR8 over Blackwater River built?

It was built in 1997, making it 28 years old in 2025.

What condition is I10 SR8 over Blackwater 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 November 2024.

How much traffic does I10 SR8 over Blackwater River carry?

About 21,000 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is I10 SR8 over Blackwater River?

The structure is 3,109 ft (947.6 m) long with a longest span of 220 ft (67.1 m) and a deck 43 ft wide.

Who owns I10 SR8 over Blackwater River?

It is owned by the State Highway Agency.