Eilean Trodday is about 38 hectares (94 acres) in extent and the coastline has various caves and stacks. The island was inhabited in the past and there are the ruins of a small chapel, which may have been dedicated to St. Columba.
The Dutch trawler Alexanders ran aground and sank on the south side of Eilean Trodday on 29 January 1974. On 2 May 1976 the German Coaster Nordhuk was carrying a cago of grain from Gothenburg to Liverpool. Running on automatic pilot she hit the north east coast of the island near the lighthouse and sank in 28 metres (92 ft) of water. The stern section of the vessel remains intact about 100 metres (330 ft) offshore.
In 2002 the nuclear submarine HMS Trafalgar grounded on nearby Fladda-chuain whilst travelling at 14.7 knots (27.2 km/h) during a traverse of the Fladda-chuain-Eilean Trodday trough, resulting in some damage to the submarine and three minor injures to the crew. After the grounding the submarine re-surfaced and proceeded to the Faslane base by surface transit. The Banff registered trawler, Brothers BF138 was wrecked on Eilean Trodday on the morning of 1 June 2006 with the loss of two lives.
The island is an excellent dive site with items of interest being the wreck of the Nordhuk and the sheets of multi-coloured jewel anemones, although the tidal currents are strong outside of slack water.
^"HEBRIDES: H5. Pabay (Strath, Skye)" Papar Project. Retrieved 6 December 2009. This source is quoting Nicolson, A. (1930) History of Skye. A Record of the Families, the Social Conditions and the Literature of the Island. ed. A. Maclean. Portree, Isle of Skye; Maclean Press. The authors of the Papar Project add: "How much weight can be placed on these dedications and the potential affiliations is unclear".