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Name:Mynydd y Grug
Hill number:5273
Height:355m / 1165ft
Parent (Ma):2297  Mynydd Machen
RHB Section:32C: Neath to Chepstow
County/UA:Caerphilly (UA)
Catchment:Rhymney, Catchment Boundaries, Usk
Watershed:Cardiff to Cape Wrath
Class:Hump, Tump (300-399m), Clem
Grid ref:ST175907 (est)
Col:250.6m  ST 1988 9033  
OS map sheet(s):(1:50k) 171
(1:25k) 166E
Comments:Spoil heap (375m) covers natural summit with highest point being a few rocks at ST 17762 90667. See Database Notes.
Change log:show changes for this hill entry
GPS data:show GPS entries for this hill

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N.B. Some hill summits are on private property or on land where there is no public right of way.  Permission should be sought from the landowner where access to a hill summit is through private land.
Please report via the contact page any logs you see below which describe or encourage acts of trespass.  Please quote the hill number and hill name.

Logged Descriptions  (logged by 64 users, only the latest 50 shown - Show all)ByDate of Ascent
Bedwas to Risca. Very minimal vegetation amid the bare soil of the moulded summit cone.Smudge14/12/2019
07.30 the hump which is a moonscape mess & aspiring Marilyn since there is maturing pune forest up to above 370metres and there are full contour lines on the 1:25k map on this former coal slag heap.vegibagger22/07/2019
1/2 Parked just after cattle grid on road to west, pretty direct walk up through mud, fly tipping, and bikers. Not the most pleasantpenbet25/06/2019
Quiet midweek morning. Relatively easy to find the way to the top. Pleasant views, but perhaps won't live too long in the memory :)kasharic20/07/2018
From Bedwas, up Church Street then Mountain Road, then across sheep field to the fenceline, onto the spoil tip, up via the track on the western face, and on to the highest point, at the eastern end.Mariana Trench23/05/2018
TGIF because I guess at weekends the rubbish dumpers and the trailbikers are out in force. Drove to near masts to N, unmade road beyond too rough for my 2WD so ran from there. Enjoyed my 35 minson this hill, in the sunshine, but that was well enough. Fridge still there.pwheeler20/04/2018
Up from Bedwas. Grim - weather & hill.ngthack01/10/2017
Must've missed Nigel by just a few hours, though I was there at 3:30AM and it was probably even grimmer then. Quite an alien experience in the dark and mist actually.Alex C01/10/2017
Parked just beyond cattle grid. Horrible area, full of fly-tipped rubbish.liljonb22/01/2017
My last top for the county / UA . Walked up Mountain Road and then on to spoil heap to HP. Good views, but not pleasantPeterD18/09/2016
from sirhowy park to eastdicky29/05/2016
Up mountain road from Bedwas. The summit was noisy with trail bikers.Chris Peart14/02/2016
From car park for Sirhowy Country Park. Pleasant walk up on track through woods to the slag heap summit.Cas-gwent12/02/2016
Walked up Mountain Road passed farm to Common and beyond.Dugswell203/07/2015
Up Mountain Road from Bedwas. No parking possible at farm. Highest point fairly obvious but probably temporaryColin Crawford03/07/2015
From Activity Centre on forest tracks.rhalstead03/04/2015
Drive up from village of Machen below and park after cattle grill and head for slag heap at top is the top !Fergalh16/11/2014
this hill is entirely made by bulldozers. does it count? park at last street uphill in Bedwas. walk up Mountain Road to the top and over rough stuff to the spoil heap. Highest point is 376m at 176906arranc06/10/2013
Went on Rhymney Ridge walk with schooldramaticjk12309/07/2013
A despoiled and ugly hill due to it consisting of spoil from the coal industry. The hill has been parially landscaped, but a lot more work is need. It's also been (and is) ruined by 4x4 and scrambler bikes using the area as a playground. The trig point has long since disappeared (maybe buried under tons of spoil).jonglew08/12/2012
Disappointing lack of glass or bathroom furnishings. As slag heaps go, not bad.Martin R28/07/2011
Parked at 18609055 next to the usual heap of broken glass but the toilet seat has gone! Also as usual, two locals in car and van carried on along the rough track heading north to Pontllanfraith! Easy walk to top of spoil heap which is partially landscapedchriswatson20/05/2011
Parked at 195906. Followed track to N of hill then up across the wasteland. Came back more directly.chrisbien09/05/2011
Parked on the verge beside the road going up the hill from Bedwas - about 50 m before the track on the right. Track seems to be ancient right of way.Malcvolm06/03/2010
Parked on the broken glass and broken toiler seat by the cattle grid.clivevilla30/01/2010
the summit of this hill is possibly the uglyest in wales deviod of any plant life showing the signs of open cast mining with a bit of fly tippinghodder03/10/2008
Accessed by driving up from Machen to within 750m parking at cattle grid. Summit is a spoil heap with about 10 rocks marking highest point. Means Heather Mountain in English.Father Ted10/09/2008
tk from Pen-y-Waun to SW RHW17/08/2002
I first walked here when I lived in Graig-y-Rhacca. I used to walk everywhere in wellies and a track-suit!PhylipSollis28/07/1979
Richie Towey05/08/2019
carole engel29/04/2017
Robert Kemp09/07/2015
Campbell Singer01/02/2015
Alan Whatley07/12/2013
Steve Q21/07/2012