My son and I did a piece of the gash last summer in one of our W/C canoes. We put in at Lobster Stream on the Penobscot and carried in the Mud Pond. We took our time and even had a few no paddle days and were out in 11 days as I recall.The trip you are proposing is the end of the ride as it were and could be done in three days and even in a couple days if you really humped. Where would you take out?
If you want to do this in 5 to 6 days, think about starting from Telos or at least Eagle and add some lakes to the trip. You'll get some nice views of Katahdin.
It's worth taking a look at the old locomotives on the Eagle Lake Tramway Carry on your way through.
The trip you are proposing has only one very short carry around Allagash Falls. You'll also need to step out for a few minutes at Long Lake Dam....don't shoot that loaded (or at all) unless you know what you are doing....spikes will do a number on your boat.
You can do the trip from the falls to Michaud Farm (one possible pullout) in hours and you can get to Allagash from the there early in the afternoon....in time for cheeseburgers and fries at the diner.
You can opt not to paddle the Chase Rapids. The rangers will take you and your gear down the river for a small fee. The river is controlled release at the rapids so you can paddle it without too much concern. If you are worried, have the rangers take your gear through for you and go through empty. Unless you have a keel on your boat, there is really nothing to worry about except possibly a few cracked ribs and some scuffing on your canvas.
Most folks will tell you to get the trip in before July since things can get a bit bony...you'll scrape below the falls in quite a few spots if you can't read the channel.
Anyway, it's a great trip...do a bit more planning.
Here are a couple sites you'll need:
http://www.northmainewoods.org/index.asp
http://waterdata.usgs.gov/me/nwis/uv/?site_no=01011000&PARAmeter_cd=00065,00060
This summer(probably July) I want to take a canoe/camping trip with my son before he leaves for college in the fall. We are looking at the Allagash in Maine for a 5 to 6 day trip. After looking at the maps/guides in seems to make sense to put in at Umsaskis Lake below the Chase rapids. We have camped and canoed alot before but not at the same time and for so long in such a "remote" area. Most of our experience has been on lakes and slow moving (no rapids) rivers. We will be using our 17' 1941 OT and our regular camping gear. Are we taking on to much for a first extended trip, will our w/c be ok on the rapids we will encounter, are there alot of portages to carry our regular ( read heavy ) camping gear? I have alot of enthusiasm and questions. Any advise would be greatly appreciated. Thanks