Lough Furnace is the lower lough in the famous Burrishoole fishery. The next lough upstream is Lough Feeagh which is the largest of the seven loughs in the Burrishoole system and is closed for angling to protect fish stocks. Furnace is a tidal lough and can get brackish with excess saltwater in low water drought conditions during the summer.

The lough gets a good run of Grilse and Seatrout from June until September with the occasional salmon of up to 12-14lb taken in recent years. Seatrout average about 1lb but there is always a chance of contacting some larger specimens and in recent years fish up to 7.5lbs have been landed. Furnace is a lovely lough with many shallow bays which are ideal for fly fishing and there is always somewhere to fish no matter what direction the wind is from.