The source of the river is near Merrymeet Junction on the A30 Road at Whiddon Down.

[citation needed] Since January 1997, a flood gauge at Yeoford measures the river height, which is normally below 0.66 metres (2 ft 2 in).

The site base level is 60.58 metres (198.8 ft) The highest recorded level is 2.69 metres (8 ft 10 in) on 25 November 2012.

Southwest of Yeoford the River Yeo forms the boundary between Colebrook Civil Parish and Crediton Hamlets Civil Parish.

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