The quarry is located directly behind (east of) the Whitehouse police station. It is just north of the soccer fields, and shares the same parking lot. The signs now say it is part of the Blue Creek Conservation Area.
The fishery has really declined over the last 3-4 years. This is due in no small part to the "mamagement methods" being used by the City of Whitehouse. About 3 years ago they cut down all of the trees that were partially submerged on the eastern end of the lake. Then, they threw in a bunch of christmas trees to try to make up for the lost habitat. Finally, they improved fishing access by cutting down many of the trees along the waters edge on the east end. The result is a loss of forage (insects, frogs) and cover/shade for the fish population.
To make matters worse, people have pulled gills out by the bucketful (literally!), and now they are much harder to come by. As a result, the quality and quantity of LM bass to be caught has suffered proportionally.
I was there last weekend, and managed 2 small bass off the west end in 3 hours of fishing. I saw more fish, but they were uninterested in my offerings.
If you go, wear heavy bug repellant as the ticks and chiggers are out in force! Also, be careful of the cliff on the west and south sides, as they are unfenced. The whole area is generally unpatrolled (ironic, considering that it is immediately behind the police station!) and a fall could spell big trouble.
Finally, the water is extremely clear - visibility is 10 ft.+, so plan your line choice accordingly.
Dan