Gateway Swim And Skate At 8510 South Main St. in Historic Houston Posted September 8, 2011 I was noticing that the shape of the Gateway pool (I call it harp-shaped) was similar in shape to the Shamrock pool. I was trying to visually decide which one was bigger, was just looking at theold aerials, but read that blue92 said Gateway was much bigger. Must have been gigantic, since I know Shamrock's had ski boats in it. BTW, I did believe you, blue92, but measured to see difference, just how much bigger, roughly (from aerial map ruler) Gateway was approximately 217' l by 141' (at widest point), Shamrock pool 154' l by 94' w.Unique shapes. Has anyone mentioned how deep both pools were? Know that Shamrock's had to be pretty deep, it had those diving towers.This description of the Shamrock pool from Wikipedia:"To the south was the hotel's lavishly landscaped garden designed by Ralph Ellis Gunn, a terrace and an immense swimming pool measuring 165 by 142 feet (50 by 43 m) described as the world's biggest outdoor pool, which accommodated exhibition waterskiing and featured a 3 story-high diving platform with an open spiral staircase."