The Blanding's turtle (considered threatened or endangered) was proposed as the official state reptile of Minnesota in 1998. Blanding's turtles (Emydoidea blandingii) are one of the longest lived turtles (may live over 70 years), but take 18 - 22 years to reach sexual maturity and over 75% of their eggs are eaten by predators (such as raccoons, skunks, ravens, large fish, crows, and ants). Even nests not ravaged by predators often fail because of flooding, poor conditions, and other factors.

To help conservation efforts, do not collect or disturb a Blanding's turtle (unless seen on the road - if you can stop your vehicle, do so, and move the turtle to the side of the road in the direction it is traveling).

Source:

Minnesota State Symbols--Unofficial: Minnesota Legislature
Far Flowing Water: Audubon Society Grand Haven Michigan

Links:

State Reptiles & Amphibians - 50 States List