[1] From west to east lie Griffin, Three Valley, Victor, and Clanwilliam lakes along the Eagle River.

[9] In 1955, the section along Three Valley Lake was widened, which involved the removal of over 190,000 cubic metres (250,000 cu yd) of material over a three-month period.

During times of road closure, a tug pushed a four-car capacity former reaction ferry, which carried about 10,000 vehicles over the duration of the project.

One explosives blast unexpectedly brought down so much material that the highway was closed for nine days, causing ferry waits of up to 24 hours.

[14] Walter Moberly, discoverer of Eagle Pass in 1865, chose the lake name on observing the inflow streams from the three mountain valleys.

When triggered by a technician, the device drops explosives charges, sending a wall of snow down the cliff face.

[20] In 2019, a pilot rockfall fencing system was installed on a section to reduce the chance of rocks landing on the highway.

[29] In April 1999, about 5,000 to 10,000 cubic metres (6,500 to 13,100 cu yd) of material came down in a landslide on the north side east of the lake.

[30] In April 2002, a landslide on the south side swept a highway maintenance worker to his death in the icy lake.

The discovery in the 1886–87 winter that these were also occurring in the lakes stretch came as a surprise, prompting a recommendation that the building of snowsheds there should be given priority.

[39] In 1909, a snowslide derailed a freight train, sending both locomotive crew members to their deaths in Three Valley Lake.

[40] That spring, a landslide destroyed several stretches of track about 1.6 kilometres (1 mi) west of the station,[41] and high water washed out the wooden rail bridge over the river.

[48] In 1912, a speeding westbound locomotive collided head on with an eastbound passenger train midway along Three Valley Lake, killing the latter fireman.

[50] In 1936, the Three Valley section house stood in for the original Port Moody station during the filming of the movie Silent Barriers (1937).

On plunging 30 metres (100 ft) down an embankment, the locomotive came to a stop on piercing the ice of Griffin Lake.

[56] William Mundy built a large sawmill[14] about 500 metres (550 yd) south of the present highway overpass on the shore at the western end of Three Valley Lake.

[74] His Mundy Lumber Co. opened a general store in March 1905,[75] and production started at the mill that August.

[80][81] The sawmill and planning mill, destroyed by fire in 1909,[82] were rebuilt months later with an 18,000-metre (60,000 ft) daily capacity.

[14][91] During the early 1900s, Robert Dahalberg homesteaded near the mouth of South Pass Creek (between the present Rutherford Beach rest area and the pullout).

[100] World War II Japanese Canadian internment camps operated April 1942 to July 1944 at Griffin and Three Valley lakes.

[103] In 1956, Gordon and Ethel Bell purchased the site and dumped more than 25,000 tonnes (28,000 short tons) of rock onto the swampland at the eastern end of Three Valley Lake.

[104] After building a seven-seat coffee shop, seven-room motel, and museum, the facilities opened in 1960[105] but did not break even until 1974.