You can access J-1010 from either the old highway 93 segment off Park Circle Dr in Jette Lake or off US93 just a little to the north. Not exactly a P&G but you should be able to park fairly close. Area should be muggle free. Road is narrow; if you are concerned about scratching your vehicle, you may want to park in a wider spot of the road and hike the rest of the short way.
Although the area should be muggle free, be prepared for wildlife encounters. Bear spray might be a handy tool.
Remember, if you are not a tribal member you will need to carry a tribal conservation permit to recreate on Flathead Indian Reservation land. You can get your yearly conservation permit in Polson at Walmart and in Ronan at Ronan Sports and Western and many other locations throughout the valley.