Peter Mortensen Collection BCFP Renfrew Div. The first picture is the Three Rivers Creek Trestle . When the logging rail road was lifted in 1958 , the rail grade and trestle continued to be used to haul logs over . In 1966 the useful life of the trestle was coming to an end . The gorge that the trestle crossed required major a structure to replace the existing bridge . A plan to build a Haul Road up the West side of the creek and bridge the Three Rivers Cr. at better location and join up with the Three Rivers Cr. M/L on the East side of the Creek was developed . The Engineering crew laid out the new road , The area west of the bridge had been "Logged" in the late 1950's . A Cat operator started building the new road in the Summer of 1966 . The next pictures show how far the grade was built . The rock formation in that area is shale and slate , following the grade stakes on the center line the operator was cutting in to the high side and building up the low side . There was an old log that was left on the grade , The Cat operator backed the Cat up to the log and as the Cat Swamper set a choker on the log , what ever was holding up the surface the cat was sitting on broke loose . The whole area the Cat was sitting on started sliding down the side of the ravine as if it was on an elevator . The Cat Skinner who was young , spry and had the quick reactions to bail off the Cat , did so . The marks were on the side hill below the grade level where he scrambled to get back up on to the road grade . The Cat was about 3 years old , a D8 with a U blade , it ended up almost under the Trestle submerged in a pool of water . The Cat dropped straight down landing upright in the water , still running . I worked on the crew that recovered the wrecked Cat . A skyline was rigged up and the heal blocks used to tighten the skyline on the "Skidder" using the "Line Horse" to raise the Cat and another Cat to pull it up the East side of the gorge . The "U blade" and "Arms" came up in 2 pieces and the Cat came up intack . I carried the operators tool box (which had stayed on the Cat ) up to the roadside , the only damage or loss was a broken ballpeen hammer handle. The Cat was a total write off .