US Bridges

SR-951 Nb(collier) over Big Marco Pass

Fair

Collier County, Florida · 7.0MI South of US-41 · Structure no. 030148

Built
1969
56 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,595 ft
3 main spans
Daily traffic
19,250
2022 count
Owner
State
State Highway Agency

About this bridge

SR-951 Nb(collier) over Big Marco Pass is a steel continuous stringer/multi-beam or girder carrying SR-951 Nb(collier) over Big Marco Pass in Collier County, Florida. It was built in 1969, so it is 56 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 19,250 vehicles a day, roughly 8% of them trucks, projected to reach 33,399 by 2044. The structure is 1,595 ft (486.2 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSR-951 Nb(collier)
CrossesBig Marco Pass
Location7.0MI South of US-41
RouteState Highway 951
CountyCollier County
StateFlorida
Coordinates25.96362, -81.70968
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.9 US tons
Inventory rating29.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+16 approach)
Design loadHS 20
Structure length1,595 ft (486.2 m)
Longest span121 ft (36.9 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,250 (2022)
Projected traffic33,399 by 2044
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$220,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR-951 Nb(collier) over Big Marco Pass built?

It was built in 1969, making it 56 years old in 2025.

What condition is SR-951 Nb(collier) over Big Marco Pass 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 April 2023.

How much traffic does SR-951 Nb(collier) over Big Marco Pass carry?

About 19,250 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is SR-951 Nb(collier) over Big Marco Pass?

The structure is 1,595 ft (486.2 m) long with a longest span of 121 ft (36.9 m) and a deck 36 ft wide.

Who owns SR-951 Nb(collier) over Big Marco Pass?

It is owned by the State Highway Agency.