I saw a reference to an old Russian measurement called Saja, if that is the correct pronunciation. What is the modern day equivalent of that?
Looks like you are asking about сажень:
1 сажень = 7 English feet = 84 inches = 2,1336 meters
It is not used since 1924 when metric system became mandatory.
Currently it is mentioned in proverbs and other sayings only, like "Косая сажень в плечах", etc. (Technically "косая сажень" is bigger measure than "сажень").
Good article is on Russian Wikipedia.
Here's a picture of what сажень is.