The lake was formed at some point in the 1830s following the construction of the wooden Yonman-Johnson dam (which now forms part of Wisconsin County Highway J), creating a lake between East Troy and Mukwonago.[6][7]
In 1894, the Lake Beulah Protective and Improvement Association (LBPIA) was established with the aim of "improving and protecting Lake Beulah and the streams and waters adjacent thereto."[7]
By 1904, the association had improved the lake strengthening the dam, introducing wall eyed pike, and formulating regulations regarding the display of lights on watercraft.
The association successfully managed to get the dam further strengthened with cement in 1909, which allowed for the lake to be maintained at a set height all year round.
A weed cutter was then purchased by LBPIA and led to the removal of weeds and tree stumps which had previously clogged some channels surrounding the lake.
Post World War Two
The end of the Second World War brought with it the advent of the commercial speedboat. Such crafts became a common occurrence on the lake and led to the issuance of a revised 'Code of Good Conduct' in 1963 which was issued to all lake front property owners.[7]
Frank L. Fraser, Wisconsin State Representative, farmer, and lawyer lived in Lake Beulah; Fraser served as the postmaster for Lake Beulah and the chairman of the East Troy Town Board.[9]
Annie Haeger, US Olympic sailor; participated in sailing competitions and other sailing activities with the Lake Beulah Yacht Club.
Stephanie Roble, US Olympic sailor; participated in sailing competitions and other sailing activities with the Lake Beulah Yacht Club.
