An obvious way up Damph is from the road between Buncrana to Glentogher. There are a number of places to start and one place is the unfenced area opposite a dam at around C4426 3722 A.
The Fullerton Pollan dam and reservoir was completed in 1997 however as of 2013 it is not shown on the 1:50,000 OSi map though is on higher zoom levels on the OSi MapGenie layer used by this website.
The walk to the top is over rough wet ground and should not take more than 70 mins there and back.
The summit has fine views over the reservoir and of the Slieve Main to Slieve Snaght ridge. Linkback: https://mountainviews.ie/summit/733/comment/5492/

Started at approx. 444373 B at a small quarry which provides a couple of parking spaces. Climb up back of quarry, clattering over loose rock and parallel a rough track, cross a delightful little burn with waterfall with foxgloves and bumble bees and head over grass towards Damph . The bulk of S Snaght draws attention to the right with its very different top of heather and stone. A farmer was herding sheep near the top with the aid of sheepdog and more modern quad. Cross a fence and some wetter ground, as rise firmer ground and another fence brings the non descript top.

Views open up along Lough Swilly, Buncrana and of course Slieve Main and Slieve Snaght to the NW (with Raghtin More visible in thier col). To the E a low line of hills stretched down towards Derry, with Lough Foyle and the start of the Sperrins just visible.

An easy 40 minutes of walking but of course it would be a crime to stop here when such other delights beckon. S Snaght and S Main are both within easy reach and on a good day the views are built up layer by layer as height is gained. Linkback: https://mountainviews.ie/summit/733/comment/3373/

Driving on the minor road to the east of these hills, we were perplexed to see a lake to our east (the right) that did not feature on the map - you can see this body of water in gerrym's photo. Fear not, it does exist - I assume this is the Pollan Dam?
From the roadside quarry it's a pleasant stroll up grassy hillside to the featureless top of Damph. The view west is dominated by the Slieve Snacht and Slieve Main, seperated from Damph by a secluded valley. Damph is an ideal starting point for a round of these central-Inishowen hills. Linkback: https://mountainviews.ie/summit/733/comment/6325/