I have been in touch with the Road Network Manager at Perth and Kinross Council and they have confirmed that anglers will be able to reach Glenquey from the south (Muckhart side).
A few points to note:
- There will be no access from the north (Gleneagles/A9) during the works
- No issues this week getting to Glenquey as the works will be underway between the road to Frandy and Gleneagles
- Next week you may be delayed by machinery in the middle of the road
The Devon Angling Association 
On the subject of access to the Glenquey, What is the recognised pedestrian route by the Devon Angling Association for anglers; from the anglers car-park to the dam head. (It used to be up the “right of access” road,)
Well done, thanks for the info.