- Building type: Castle
- Date of construction: 1610
- Architect: Not Assigned
- Listing: MON
- HB/SMR Ref: TYR016:016
- 2nd Survey by EHS: No
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Derg Castle, Castlederg
County Tyrone
Rectangular bawn with square flankers, entrance to North. Remains of North wall and house. No dressing remains and no above ground remains of 16th Century tower house in centre
| Stone Type Category: | Schist |
| Primary Stone Type: | Local Dalradian Schist (Tyrone) |
| Secondary Stone Type: | |
| Other Stone Type: | |
| Replacement Stone Type: | |
| Stonework Construction: | Un-coursed rubble |
| Stonework Condition: | Schist is in reasonably good condition with fragmentation of isolated blocks only |
| Condition Assessment (QUB): | 1 |
