The lake is beside Littlebrook Power Station, immediately south of the Dartford Tunnel. To view it, leave the Dartford Tunnel Approach Road on the A206 Dartford Northern By-pass, and at the first roundabout (immediately off the motorway) take the minor road north signposted Crossing Admin Offices and Power Station. At the little roundabout turn left towards the power station, then park about 200 yards further on on the left. The lake edge is accessible here (muddy!) and gives excellent views of large numbers of gulls.
Grid Reference: TQ555756
A good place to look for Caspian and Yellow-legged Gulls.