I am not the expert on Owasippe, but this is my understanding . . .
The section of trail across from Russell Road is off limits for now, that section of land is for sale and may not be available and so the MEMBA (newly formed Michigan's Edge Mountain Bike Association--lakeshore trails for Musk/Ottawa county) group has decided to continue trail building and planning with out it.
MEMBA has built a new 2.3 mile section of trail that weaves around whisper lake, this new section is about 1-2 miles in. It's a really great addition to the trail system. The rest of the Blue and Red loops (excluding the section across Russell Rd.) are nearly the same as they had been in the past with the exception of that last steep switch-back after the second bridge--trail was rerouted to prevent erosion and to provide a more sustainable trail section.
Currently there are 3 loop options:
Green: 4 miles
Blue: 7.5-8
Black: 11 miles
Maps are here:
http://ooec.org/assets/Owasippe_Bike_Tr ... 120818.pdf(I don't believe this map includes the new Whisper Lake trail section)
MEMBA Owasippe FB Page:
https://www.facebook.com/pages/Owasippe ... 510?ref=hl