When the steel was laid in 1926, the C.P.R. bought a piece of land to build the town of Hart. The town consisted
of a store, post office, three elevators and a Chinese Cafe. There was also a lumberyard and a blacksmith shop. A milk delivery service dropped off milk on train nights which were every Monday and Thursday.
Big Beaver is a little hamlet of approximately 22 people. In 1928, when the C.P.R. brought the rails eastward from Buffalo Gap, it became the end of the rail line. The settlement recieved its name after the exceptionally large beavers present in the area. The hamlet grew as elevators and businesses flourished in the farming and ranching district. Big Beaver may have lost it's railroad, the elevators and it's school, but the community refused to see their town disappear. The Post Office still has a six-day mail service. The general store run by Ron and Gail Aust is still in business. The municipality of Happy Valley #10 is still locally run
The hamlet got its name from two hills - 6 miles north. These hills stand out for miles around and through the gap in the hills ran the buffalo years ago - thus named Buffalo Gap. The first post office was 3 miles south east of Buffalo Gap, operated by Charles Weber. In 1928, it was moved into Buffalo Gap. It was closed in 1962. In 1928, the track was built, beginning the hamlet of Buffalo Gap. There were many businesses created. MacBride Store (later burned in 1935), Weyburn Security Bank, Poolroom, Lumberyard, three restaurants, community dance and pool hall, implement dealers, hardware, butcher shop, doctors office, barber, and blacksmith shop. Doctors held office hours every Wednesday afternoon. In 1946 the Alliance Church was built, it is now in the hamlet of Big Beaver used as their Nature Center. Many elevators were built along the rail. In 1928 the United Grain Growers Ltd and Western Elevators Co. Ltd (Western Grain) were built. In 1929 the Saskatchewan Wheat Pool created an elevator. In 1951 - 1952 Pioneer Grain took over Western Grain Co. In 1956- 1957 The Pool took over Pioneer Grain. The entertainment in Buffalo Gap included the annual Wheat Pool picnic, baseball league games, dances and card parties at the school.
On May 30, 1961 Buffalo Gap became part of Canadian weather trivia when 250mm of rain fell in under one hour.
The Canadian Pacific Railway came through the area in the summer of 1928. By Christmas of the same year four elevators were built and ready for business. The elevators included: Spencer Grain Co., Victoria Grain Co., Saskatchewan Wheat Pool, and the Searle Grain Co. A General Store was opened in 1928 and it housed the first postal office in the area. A blacksmith shop and a pool hall were opened in 1929. The community hall was opened in 1932. This is where Sunday school, Vacation Bible school and church were held. A restaurant was made and operated for a few years. There was a men's ball team and a ladies' soft ball team. In 1929 the population of East Poplar was 42. Now there is no one. The elevators were bought by other grain companies like Pioneer grain, however now they have vanished into history like all other small town elevators.