Actually, 58K is median(not mean) for graduation in private and about 40 in public. Nationally. I'm guessing that public law levels around 50K and private law levels around 150 K in ten years. The median salary in law is about 95-100K according to most stats.
What I understand is that it falls like this for the tiers in private practice:
City Town Rural
T14 125K 100K 80K
T1 100K 80K 60K
T2 80 K 60K 50K
T3 Unemployable 50K 40K
T4 Unemployable 40K 30K
..and I guess you make a bout 3 times that much when after 10 years.