In November 1884, the Canadian Pacific Railway (CP) railhead's westward advance reached Beavermouth.

[3] Inspector Sam Steele, Sergeant Fury, and about six or seven constables of the North-West Mounted Police maintained law and order within the camps.

At Beavermouth, the police post was on the opposite side of the Beaver River to the construction camp, being connected by a bridge.

[4] The police facilities included cells for 30 prisoners, a courtroom, staff dining hall, and quarters for the men.

In contrast, the worker quarters contained two long double tiers of bunks for 100 men, separated by a narrow passage.

After Steele threatened to shoot anyone who advanced on the police post, the gathering dispersed and the strike leaders were later fined.

Beavermouth was the Rogers Pass, then Connaught Tunnel, eastern slope base for pusher locomotives, which predominantly assisted westbound freight trains.

[7] In 1939, King George VI and Queen Elizabeth rode in the lead locomotive cab of the westbound royal train from Beavermouth to Stoney Creek.

[12] The following year, Madeleine Carroll rode in the cab of an eastbound passenger train from Beavermouth to Leanchoil,[13] a choice that excludes the more spectacular scenery.

[7] In 1974, the catchment lake for the Mica Dam raised the water level about 24 metres (80 ft), submerging Beavermouth.

For the track diversion to a higher elevation between Rogers and Redgrave, CP constructed four new bridges and a 336-metre (1,102 ft) tunnel,[7] and adopted concrete ties for the first time.

[33] By 1903, CRL had grown into the largest lumber group in the North Kootenays with mills at Golden, Beavermouth and Kault.

[41] Miss Catherine E. McDonald was the inaugural teacher at the school opening that year,[42] and CRL employee Fred Stalker became postmaster 1899–1902.

[7] 1886: Trees falling onto the track during a forest fire derailed the tender and baggage car of an eastbound passenger train.

[7] 1900: About 5 kilometres (3 mi) to the east, a westbound freight locomotive overturned on smashing into a rockslide, killing the engineer.

[74] 1905: During shunting operations, a steel rail slipped from a flatcar fatally pinning a brakeman who was coupling two cars.

[75] 1907: When a freight train collided with a railway handcar carrying six section workers across the bridge, five men jumped clear, but one died from his injuries.