US Bridges

CR 177A over Mill Branch

Fair

Holmes County, Florida · 6.0 MI North of US90/SR10 · Structure no. 520069

Built
1955
70 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
750
2022 count
Owner
County
County Highway Agency

About this bridge

CR 177A over Mill Branch is a concrete culvert carrying CR 177A over Mill Branch in Holmes County, Florida. It was built in 1955, so it is 70 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 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 750 vehicles a day, roughly 10% of them trucks, projected to reach 825 by 2042. The structure is 23 ft (7 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCR 177A
CrossesMill Branch
Location6.0 MI North of US90/SR10
RouteCounty Highway 177A
CountyHolmes County
StateFlorida
Coordinates30.8639, -85.77151
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: 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 rating41 US tons
Inventory rating24 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2022)
Projected traffic825 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was CR 177A over Mill Branch built?

It was built in 1955, making it 70 years old in 2025.

What condition is CR 177A over Mill 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 January 2024.

How much traffic does CR 177A over Mill Branch carry?

About 750 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is CR 177A over Mill Branch?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.5 m).

Who owns CR 177A over Mill Branch?

It is owned by the County Highway Agency.