From: The Living Islands Project
THE LANCE MITAN SUSPENSION BRIDGE
Trinidad
Back to Ref: Suspension Bridge

Map - In the Newspapers
The Lance Mitan Suspension Bridge - Replacing the Lance Mitan Bridge
Damaged Boat - Damaged Flat Bridge

Why The Lance Mitan Suspension Bridge Failed

   Without a sustained ‘Preventative Maintenance’ policy; corrosion caused collapse. The following picture shows the corrosion to the irreparable surviving upper main loadbearing cable. The broken cables would be in a similar condition. Continued application of suitable paint would have preserved the bridge.

Upper Cable corrosion   The inevitable collapse of the Lance Mitan suspension bridge after 99 years is a statement to clever and economic civil engineering defeated by shoddy maintenance.
   The reasons for the bridges construction in the first place, may be attributed to the agriculture of cocoa and other related produce that came from the estate at the ‘other side’ of the river. Remains of structural foundations and other not insignificant wall-works at the ‘beach’ indicate other economic activities which may have included fishing and the siting of a small port.
   A down turn in the economy of the agricultural sector over the intervening years increased the vulnerability of the bridge. As time passed, the area in which the bridge is sited was perceived to be of less commercial significance and being geographically in the ‘far south’ was practically forgotten.
   The inevitable neglect by an under funded Regional Corporation to maintain this bridge, has now led to the loss of a small treasure to the nation.
   This is not the only bridge to have been lost in this area.


   What may have also been sadly lost, but for other reasons, is the Regional Corporations engineering ability to rebuild a suspension bridge.
   Any statement
(4) that claimed that the bridge would have been in a state of repair in time for Augusts celebration of the 500th anniversary of the discovery of Trinidad by Columbus, which occurred within this region, would be totally fallacious. This is because the bridge has been beyond ‘safe’ repair for at least 15 years; chiefly due to the state of corrosion in the main suspension cables; the reason for the collapsed on Carnival Sunday.
   To have ‘repaired’ the bridge would have required ‘restringing’ the main cables. I have doubts that this was part of the ‘repair’ agenda.
Upper Main Cable 2
Upper Cable corrosion    On the left is another view of the corroded upper main cable. Attached to it is what is left of probably one of the few original ‘stringers’; made from smaller gauge cable that, at suitable intervals, are strung to support the load of the lower cable.
   On the right is an example of corrosion in the lower cable. Around it is the ‘ring’ of one of the newer type of ‘solid rod stringer’ that was used in maintenance of the bridge. Paint has preserved part of it - as it has some of the lower cable itself; but this ‘stringer’ has also failed due to corrosion along parts of its length. It now dangles its end in the water. Lower Cable corrosion
Corrosion on Solid Stringer    In the foreground of the picture of the damaged fishing boat is an example of corrosion to one of the ‘solid rod stringers’.
   Kinking, rather than curved bending, of the ‘solid rod stringers’ in the background, indicate points of corrosion.

   Maintenance of the bridge over the years has replaced the original ‘flooring’ of the bridge with ‘I’ beams that have been used to span the lower cables of the bridge. ‘I’ beams were not available to the original builders as they are a product of a continuous steel process that was not developed until after the turn of the century. Over these ‘I’ beams wooden planks were used to made up the floor of the bridge. The ‘I’ beams were held in place on the lower cable by ‘U’ bolts.

I Beams I Beam and Rusty U Bolt

   The pictures above show the general spacing of the ‘I’ beams as they made up the ‘floor’ and the position of the fixing ‘U’ bolts. The ‘U’ bolts show heavy corrosion.

Missing I beams    The surviving lower cable here shows where the ‘I’ beams ought to have hung after the opposite cable broke. They are absent because the corroded ‘U’ bolts snapped; dropping the beams to the bottom of the river.
   Corrosion is shown on the dual solid ‘anchor’ rods that connect the main suspension cable to the ground foundations. The riveted wrought-iron structure of the ‘upright’ is shown in the background, onto which the old sign reading ‘NOTICE Bridge closed to vehicular traffic’ is fixed.
   The condition of the ‘upright’ structure was not examined in any detail for this ‘passing’ survey; so no comment on its condition is available here.
Corrosion to Anchor rods

Map - In the Newspapers
The Lance Mitan Suspension Bridge - Replacing the Lance Mitan Bridge
Damaged Boat - Damaged Flat Bridge


Images: Digital CASIO QV-100 © 1998: tobagojo@trinidad.net
The Living Islands Project
© 1998: tobagojo@gmail.com - 980308
Last Update: 02 June 1998 00:00:00
Processed by: Jeremy G de Barry
Back to Ref: Suspension Bridge
 
Welcome to The Lance Mitan suspension bridge project. Press for update when On-Line; or copy PAGE URL from here. http://www.seetobago.org/trinidad/sbridge/lmsb2.htm © 1997: tobagojo@gmail.com - 19980308 - 1m20071228 - 2m20140615
Historic Update: 02 June 1998; Last Update: 20 June 2014 01:30:00 TT
Processed by: Jeremy G de Barry
An historic web page for this site; one of the first set by The Living Islands Projects. The page is left mostly in its origional presentation format, apart from an external update to its active eMail link; and internal coding and 'METAS' that update its compatability, list its content and records its dating history. This footer is added for update compatibility.