I-97 and I-197 selected action from the EIS for the Baltimore/Annapolis Transportation Corridor Study circa 1980
more information see below
The selected action proposes upgrading portions of the Baltimore Beltway, Maryland Routes 3 and 32 and US route 50/301 to Interstate standards. Plus 6 miles of new highway near Crownsville to complete the link to US-50/301.
Mileages are as follows:
I-97 33.62 miles
Termini: I-95/495 to I-695
I-197 4 miles
Termini: I-97 to MD-70




Sources:
1.Mileages are from Maps
2. Map above is from EIS# FHWA-MD-EIS-78-02-F