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
132
Active
0
Offline
1
Open flags
2
thames
River Thames
215 miles through Gloucestershire, Oxfordshire, Berkshire, and London. The most-monitored river in England.
Overflows
119
Active
0
Offline
6
Open flags
10
trent
2 active
River Trent
185 miles from Staffordshire to the Humber. Industrial heartland river — high pressure from sewage and agriculture.
Overflows
133
Active
2
Offline
0
Open flags
4
wye
1 active
River Wye
155 miles through mid-Wales and the English border. SSSI river — agricultural runoff has driven WFD status to 'unfavourable-declining'.
Overflows
51
Active
1
Offline
0
Open flags
4
lugg
River Lugg
45 miles from Powys through Presteigne and Leominster to the Wye below Hereford. Named in the Wye catchment phosphate case; a Site of Special Scientific Interest for much of its length.
Overflows
10
Active
0
Offline
0
Open flags
0
usk
River Usk
From the Black Mountains through Brecon, Abergavenny and Usk to Newport and the Severn Estuary. The River Usk is a Special Area of Conservation for much of its length.
Overflows
32
Active
0
Offline
0
Open flags
0
afon-lwyd
Afon Lwyd
Thirteen miles from the hills above Blaenavon through Abersychan, Pontypool and Cwmbran to the Usk at Caerleon. A valleys river rebuilt from its industrial past, with a riverside trail along much of its length.
Overflows
52
Active
0
Offline
0
Open flags
0
mersey
River Mersey
70 miles through Manchester and Liverpool. Once Britain's most polluted river — recovering, but heavily monitored.
Overflows
114
Active
0
Offline
2
Open flags
5
great-ouse
River Great Ouse
143 miles across East Anglia. Fishing, paddling, and the Cambridge Backs.
Overflows
56
Active
0
Offline
2
Open flags
3
don
River Don
70 miles through South Yorkshire, joining the Trent at the Aire. Severe legacy industrial pollution + active sewage discharges.
Overflows
81
Active
0
Offline
4
Open flags
5
tyne
River Tyne
73 miles from the Pennines through Newcastle to the North Sea. Salmon-bearing, with major estuarine monitoring.
Overflows
198
Active
0
Offline
5
Open flags
6

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 Lugg

River Usk

Afon Lwyd

River Mersey

River Great Ouse

River Don

River Tyne