Portions of the following information were taken from Florida Geological Survey Bulletin 66.

Last Spring is located on the bottom of the Tampa Bypass Canal near the center of the canal. It is approximately 0.35 miles north of the I-75 bridge and just 150 ft southeast of the boat access barrier cable across the canal. Last Spring can be reached by boat from the south.

Description - Last Spring discharges from the bottom of the Tampa Bypass Canal. Clear spring water mixes with tannic canal water over the vent. Turbulence from spring discharge creates a circular slick spot on the surface of the canal waters. Canal depths near the spring average 15 ft, but depth measured over the vent is 20 ft. The Tampa Bypass Canal was constructed to divert flood waters of the Hillsborough River around Tampa. Canal construction appears to have broken into underground conduits and tapped into the Floridan Aquifer System. At least three new springs were created during canal building - Canal Spring, Double Spring, and Last Spring. Each of these springs is visible as slick circular boils on the surface of the dark waters of the canal.