Featured rivers

By river

Each river page aggregates every storm overflow, sampling point, hydrology station and discrepancy along its course. Designed for the local user — “I fish the Severn at Stourport, what's happening on my stretch?”

severn
River Severn
Britain's longest river — 220 miles from Plynlimon, mid-Wales, to the Bristol Channel. Salmon, paddleboarders, and Worcester's Diglis swimming spot.
Overflows
113
Active
0
Offline
1
Open flags
6
thames
River Thames
215 miles through Gloucestershire, Oxfordshire, Berkshire, and London. The most-monitored river in England.
Overflows
123
Active
0
Offline
4
Open flags
10
trent
1 active
River Trent
185 miles from Staffordshire to the Humber. Industrial heartland river — high pressure from sewage and agriculture.
Overflows
144
Active
1
Offline
0
Open flags
12
wye
River Wye
155 miles through mid-Wales and the English border. SSSI river — agricultural runoff has driven WFD status to 'unfavourable-declining'.
Overflows
66
Active
0
Offline
0
Open flags
3
mersey
River Mersey
70 miles through Manchester and Liverpool. Once Britain's most polluted river — recovering, but heavily monitored.
Overflows
128
Active
0
Offline
2
Open flags
12
great-ouse
1 active
River Great Ouse
143 miles across East Anglia. Fishing, paddling, and the Cambridge Backs.
Overflows
46
Active
1
Offline
2
Open flags
8
don
River Don
70 miles through South Yorkshire, joining the Trent at the Aire. Severe legacy industrial pollution + active sewage discharges.
Overflows
113
Active
0
Offline
3
Open flags
10
tyne
River Tyne
73 miles from the Pennines through Newcastle to the North Sea. Salmon-bearing, with major estuarine monitoring.
Overflows
204
Active
0
Offline
6
Open flags
28

Don't see your river? Every named watercourse with monitored storm overflows has its own page — browse the full directory →

River Severn

River Thames

River Trent

River Wye

River Mersey

River Great Ouse

River Don

River Tyne