The bird sanctuary on the east side Dartnall Rd, between Rymal Road and Stonechurch Road, was originally owned and operated by the Monkley family, and their son, Billy, was the gatekeeper. The waterfall was 'discovered' in 2009 and named after Billy.
| Location | 79°49'49.606"W 43°11'25.451"N |
| Park | Mount Albion Conservation Area |
| River | Tributary of Redhill Creek |
| Form | Classic Cascade |
| Flow | Year Round |
| Crest Restriction : Access | None : Easy |
| Foot Restriction : Access | None : Easy |
| Height : Width (m) | 3.00 : 6.40 |
| Height : Width (ft) | 9 : 20 |
| Authority / Owner | Hamilton Conservation Authority |