What are the three largest lakes other than great lakes in the US?
Some of the largest Non-Great lakes by surface area in the US
are:
Great Salt Lake, UT 1,700 sqmi
Iliamna Lake, AK 1,014sqmi
Lake Okeechobee, FL 730 sqmi
Lake Pontchartrain, LA 630 sqmi
Becharof Lake, AK 453 sqmi
Lake Champlain, NY+VT 435sqmi
Selawik Lake, AK 404 sqmi
Salton Sea, CA 376 sqmi
Lake Mead, NV 248 sqmi
Note that The great Salt Lake (obviously), the Salton Sea and
Lake Pontchartrain are not freshwater lakes, Lake Champlain is not
entirely within the US - a small part extends into Quebec, and Lake
Mead is the Largest Artificial lake in the US.