At Warwick, the canal rises by two locks to Budbrooke Junction (formerly the junction with the then-independent Warwick and Birmingham Canal). To the left is the restored Saltisford Canal Arm, a short stretch that used to run under the railway to the original canal basin complex and terminus of the Warwick and Birmingham Canal – the basin was filled-in in the 1970s. The canal used to serve the oldest gas works in the world and several unusual hexagonal buildings remain opposite Sainsbury's. After half a mile the mainline reaches the bottom of the Hatton flight of 21 locks that lift the canal up out of the Avon Valley. The first 10 locks are spaced out but from the middle lock the flight is tightly spaced.
