LOUISIANA’S MOVABLE BRIDGES

C. HANCHEY

http://bridgehunter.com/photos/19/84/198445-L.jpg

JARRETT LAMBERT, P.E.

DOTD

LOUISIANA’S MOVABLE BRIDGES

• HOW MANY?

• WHERE ARE THEY?

• WHAT TYPES?

• HOW OLD ARE THEY?

LOUISIANA’S MOVABLE BRIDGES

38 34

0 2 8

1 2 7 9

0

10

20

30

40

02 03 04 05 07 08 58 61 62

DOTD DISTRICT

MOVABLE BRIDGES BY DISTRICT

04

58

05

08

61

03

07

62

02

LOUISIANA’S MOVABLE BRIDGES

7

37

[VALUE]

8

0

10

20

30

40

50

60

BASCULE VERT. LIFT SWING PONTOON

MOVABLE BRIDGE TYPES

LOUISIANA’S MOVABLE BRIDGES

BASCULE

CHARACTERISTICS:

SINGLE OR DOUBLE LEAF

PIVOTS ON TRUNNIONS

COUNTERWEIGHT ABOVE OR

BELOW ROADWAY

UNLIMITED VERTICAL CLEARANCE

LOUISIANA’S MOVABLE BRIDGES

BASCULE

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WWW.SAILINGBAILANDO.COM

LOUISIANA’S MOVABLE BRIDGES

VERTICAL LIFT

PATRICK FELLER

https://www.flickr.com/photos/nakrnsm/14224767125/in/photostream/

IRMA HALE

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C. HANCHEY

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CHARACTERISTICS:

MOVABLE SPAN SUSPENDED

FROM TOWERS

LIMITED VERTICAL CLEARANCE

SPAN BALANCE CRITICAL FOR

LOUISIANA’S MOVABLE BRIDGES

VERTICAL LIFT C. HANCHEY

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C. HANCHEY

http://bridgehunter.com/photos/19/74/197413-L.jpg

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union/

CLIFF DARBY

http://bridgehunter.com/photos/15/55/155516-L.jpg

LOUISIANA’S MOVABLE BRIDGES

SWING

JARED MIXSON

http://bridgehunter.com/photos/24/13/241333-L.jpg

C. HANCHEY

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CHARACTERISTICS:

MOVABLE SPAN ROTATES ABOUT

CENTER PIER

BALANCE IS CRITICAL

EQUAL ARM OR BOBTAIL

UNLIMITED VERTICAL CLEARANCE

LOUISIANA’S MOVABLE BRIDGES

SWING

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C. HANCHEY

http://bridgehunter.com/photos/19/84/198499-L.jpg

LOUISIANA’S MOVABLE BRIDGES

PONTOON

WWW.NOLA.COM

CHARACTERISTICS:

FLOATING BARGE ROTATES ABOUT

PIVOT POINT ADJACENT TO

APPROACH

APRONS RAISE & LOWER WITH

WATER LEVEL

UNLIMITED VERTICAL CLEARANCE

C. HANCHEY

http://bridgehunter.com/photos/19/84/198482-L.jpg

LOUISIANA’S MOVABLE BRIDGES

PONTOON

LOUISIANA’S MOVABLE BRIDGES

9

7

5

12

15

26

8

14

5

0

5

10

15

20

25

30

0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90

QU

AN

TIT

Y

YEARS

AGES OF MOVABLE BRIDGES

LOUISIANA’S MOVABLE BRIDGES

I-10 AT EAST PEARL RIVER

PHOTO COURTESY OF MDOT

QUESTIONS?