River Hertford Posted on 22 April 2009 by Paul Ashton View River Hertord in a larger map Habitat Canalised river draining into the River Derwent. Access Car park just north of the bridge over the A64 and also the bridge at Folkton Carr. More Information OS Map from BING Maps Species List Beautiful Demoiselle Calopteryx virgoBanded Demoiselle Calopteryx splendensBlue-tailed Damselfly Ischnura elegansAzure Damselfly Coenagrion puellaSouthern Hawker Aeshna cyanea