Just back from Saligrama (near Kundapura). I took the following route while going . Bangalore -> Tumkur-> gubbi -> Arsikere -> Shimoga -> Jog falls -> Kargal -> Linganmakki -> Kollur -> Kundapura -> Saligrama.
Bangalore to Tumkur is a breeze. To go to Gubbi from there, you can either take a bypass road or go inside Tumkur town and then to Gubbi. I took the bypass road and it is is very bad shape.
But after you touch the Highway, the road is in good condition. The stretch between Birur and Tarikere is average, there are a lot of surprise pot holes so you got to keep your speed with in reasonable limit. About one KM stretch after Birur is extremely bad so be careful. Again after Tarikere till Shimoga the road is in good condition.
Shimoga to Jog falls, the road is average with few bad patches, but motorable.
From Jog to Kollur we went via Kargal and Linganmakki (Not via Bhatkal).
Check this out:
My Saved Places - Google Maps
Till Kollur this road is not in very good condition. Though there are no pot holes, but the surface is depleted. You can easily maintain a speed of 40-50kmph. If you ever happen to take this route to kollur from jog falls make sure that you take during day time only. This road passes through forest area and has hardly any, so called villages on the way. You might even find it difficult to find a human being to ask for the directions. There are remote houses here and there, and that's it. And if your vehicle needs repair, its very difficult to find any help in the middle of the forest.
After Linganmakki, I could have gone to Bhatkal and taken the highway or the above route. On the highway the big craters would have gobble my car and on the route above probably some wild animals would have eaten me up. I preferred to be eaten up by wild animals rather than by the huge craters on the highway, and I am glad I chose this option
.
Kollur onwards the road is good. I wanted to join the NH 17 near kot high school as suggested in this thread. But somewhere I missed the turn towards Halady and landed up few KMs before Kundapura. Drive from there till Kundapura is anybody's nightmare with huge pot holes. Kundapura onwards the road condition is decent.
While comming back I took this route:
Saligrama -> Brahmavara -> Hebri -> Agumbe -> Thirthalli -> Shimoga -> Bangalore
Till The beginning of Agumbe ghat the road is mostly in good condition. Agumbe ghat is also motorable though not in best of the conditions. Agumbe onwards its a breeze. The local roadside vendor (thele wala) at the sunset point in Agumbe ghat mentioned that 3 months from now the ghat road will be closed for a year or so for road widening. Is this good news? Well may be yes or may be not. Agumbe forest is a very sensitive ecological area. Wide roads means more vehicles, bigger vehicles. And it means more pollution. I think repairing the road is enough.