The purpose of this study is to conduct hydrodynamic mapping of the Cretaceous Horseshoe Canyon (HSC) Formation within the area covering T.20-25, R.15W4M-1W5M. Results of this study show no evidence of an updip water leg within the HSC Formation and show that the HSC is a pervasive underpressured gas-charged system. There is evidence that indicates the Upper HSC is possibly leaking to surface; however, more research is required to confirm this statement. The HSC has a number of pools with coincidental average pool pressures that may or may not be connected. Variability in the level of permeability is common within the HSC.