US Bridges

CR 399 over Unnamed Branch

Poor

Santa Rosa County, Florida · 0.7 MI South of CR 164 · Structure no. 580068

Built
1901
124 years old, rebuilt 1960
Condition
Poor
inspected March 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
500
2023 count
Owner
County
County Highway Agency

About this bridge

CR 399 over Unnamed Branch is a concrete culvert carrying CR 399 over Unnamed Branch in Santa Rosa County, Florida. It was built in 1901 and reconstructed in 1960, so it is 124 years old, older than the Florida average of 41.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 500 vehicles a day, roughly 8% of them trucks, projected to reach 868 by 2044. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCR 399
CrossesUnnamed Branch
Location0.7 MI South of CR 164
RouteCounty Highway 399
CountySanta Rosa County
StateFlorida
Coordinates30.88499, -87.07987
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating54 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic868 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 399 over Unnamed Branch built?

It was built in 1901, making it 124 years old in 2025. It was reconstructed in 1960.

What condition is CR 399 over Unnamed Branch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does CR 399 over Unnamed Branch carry?

About 500 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is CR 399 over Unnamed Branch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3.2 m).

Who owns CR 399 over Unnamed Branch?

It is owned by the County Highway Agency.