By the time of construction of the Welland By-Pass in 1967-1973, the original headwaters in the Wainfleet Marsh have all but disappeared, and most of what flow there was in the creek was coming from an earlier tributary called Indian Creek by some maps. This made Lyons Creek somewhat U-shaped, as Indian Creek flowed west before joining the original Lyons Creek. During the By-Pass construction, the creek was cut into three parts, and now what was once Indian Creek flows into the canal (photo). A couple kilometres north, Lyons Creek is fed directly from the canal (photo). The middle part of the creek dried up and much of its bed was torn up during the construction of approaches to the Townline Tunnel.