The Muckle Spate was a great flood in August 1829, which devastated much of Strathspey, in the north east of Scotland. Muckle is a Scots word for 'much' or 'great'.^[2]

It began raining on the evening of 2 August 1829, and continued into the next day when a thunderstorm broke over the Cairngorms. To the south, the River Dee rose rapidly above its normal level - 15 ft (4.6 m) in places (27 ft at Banchory).^[3] The Rivers Nairn, Findhorn, Lossie and Spey were affected, to the north.^[4]

As well as flooding, many bridges were washed away, including those over the Linn of Dee and Linn of Quoich. The original Mar Lodge was affected. Carrbridge's most famous landmark, the old bridge, built in 1717,^[5] from which the village is named, was severely damaged and left in the condition we see today. Homes were lost in Kingston, Moray, a small village on the Moray Firth coast, at the mouth of the River Spey. Five Findhorn fishing boats rescued residents trapped by the floods on the plain of Forres.^[6] Across the north-east between six and eight individuals lost their lives, 22 bridges and 60 houses were destroyed and 600 families were made homeless.^[7][1]

The Muckle Spate is remembered in a poem of the same name by David Grant, written circa 1851, describing the effect on the parish of Strachan.^[8]