does the fence run the entire length of sandcastle drive now(like all the way up to cost-co), or is it only a few hundred meters up from the western end of the sandcastle parking lot?
as far as the "jumpability", that relies heavily on ones own levels of personal dextreity and fence hopping experiance.
The other week the Major Taylor Ride was stuck behind a closed gate @ sandcastle, but there were some plastic jersey barriers that could be used to assist in the climb.
short answer: yes*