The real problem is that the lake is filled with sediment, which makes it more shallow and causes the water to be at a higher temperature. In order to make any semblance of reclaiming the lake, they would need to do some serious dredging. The shallow depth and abundance of fertilizers in the water have caused large algae blooms that essentially kill off plant life in the lake and make it practically impossible for native fish to survive. The only fish that do well in Utah lake are carp and other trash fish. The other factor is the water that is feeding into the lake. Many of the old mountain creeks that once fed into the lake have been diverted, dammed, or otherwise changed. This has caused the water that is being fed into the lake to be warmer and more polluted with pesticides and fertilizers. Getting rid of Geneva steel has probably helped, but superfund cleanup sites take decades of mitigation, and Geneva is being replaced by other businesses and housing.