US Bridges

Gamm RD Ext over Gamm RD Ext. Dooley Bayo

FairPosted for load

Caddo Parish, Louisiana · 1.9 MI N Int HWY 169 · Structure no. 040932440935321

Built
1929
96 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
98 ft
3 main spans
Daily traffic
98
2019 count
Owner
County
County Highway Agency

About this bridge

Gamm RD Ext over Gamm RD Ext. Dooley Bayo is a steel stringer/multi-beam or girder carrying Gamm RD Ext over Gamm RD Ext. Dooley Bayo in Caddo Parish, Louisiana. It was built in 1929, so it is 96 years old, older than the Louisiana average of 43 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. Its operating status is: posted for load restriction.

It carries about 98 vehicles a day, projected to reach 107 by 2039. The structure is 98 ft (29.9 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesGamm RD Ext
CrossesGamm RD Ext. Dooley Bayo
Location1.9 MI N Int HWY 169
RouteCounty Highway 0
CountyCaddo Parish
StateLouisiana
Coordinates32.73359, -93.88741
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating21.1 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length98 ft (29.9 m)
Longest span33 ft (10.1 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98 (2019)
Projected traffic107 by 2039
Trucks—
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 Gamm RD Ext over Gamm RD Ext. Dooley Bayo built?

It was built in 1929, making it 96 years old in 2025.

What condition is Gamm RD Ext over Gamm RD Ext. Dooley Bayo 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 March 2023.

How much traffic does Gamm RD Ext over Gamm RD Ext. Dooley Bayo carry?

About 98 vehicles per day (2019 count).

How long is Gamm RD Ext over Gamm RD Ext. Dooley Bayo?

The structure is 98 ft (29.9 m) long with a longest span of 33 ft (10.1 m) and a deck 26 ft wide.

Who owns Gamm RD Ext over Gamm RD Ext. Dooley Bayo?

It is owned by the County Highway Agency.