Swale, Ure, Nidd and Upper Ouse catchment
• York Castle Mills Sluices • York • ID: L2471 • Level
⚙ Sluice gauge: it measures the water at the Castle Mills Sluices in York, so its level is set by the sluices when they open or close as well as by the river.
(11h ago) • 4 readings/hr • 159 views
Set water level alerts
Get notified about York Castle Mills Sluices — tick as many as you like, they all share the notify settings below.
Alert me when (tick one or more)
Height for "Above a height"
Drag the line on the chart, or type a value:mAOD
Quick pick:
You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
You'll be notified when a storm overflow starts discharging, from the water companies' near-real-time feeds. Which overflows:
Notify by (tick one or more)
Your browser will ask permission, then you'll get a notification even when FloodRadar isn't open.
On iPhone: tap Share → Add to Home Screen first, then open it from there and set the alert. Show me how
Each one is saved as its own alert — pause or remove them individually any time.
Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Flood predictions aren't generated for
lock / structure gauges —
their levels are driven by gate operation,
not by catchment rainfall, so the forecast models would have no skill here.
Typical rise rate: 1 cm/hr (p95 sustained over 90 days)
Typical data delay: ~22 min (measured reading→publication lag)
Tidal: No
Distance to the sea: about 89 km by river (estimated along OS Open Rivers)
Lock / structure: ⚙ Yes — Sluice gauge: it measures the water at the Castle Mills Sluices in York, so its level is set by the sluices when they open or close as well as by the river.
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
20 storm overflows are traced upstream of this gauge, the nearest 330 m away along the river. 0 report discharging now, 20 report not discharging.
Yorkshire Water · into Holgate Beck · 2.8 km away in a straight line · its watercourse is not on the river map
16 spills · 11 hours in 2025
Not discharging now · last
11 more within 6 km whose connection is not known.
36 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are not listed.
These are the water companies' monitor statuses; a spill does not by itself explain a change in the gauge level. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels. Sewage & storm overflows →
Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record.
See also the York Castle Mills Sluices flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 24 areas linked to this gauge, nearest first.
Is the River Foss at York Castle Mills Sluices flooding today?
The current level is 7.57mAOD, which is within the typical range of 7.51 to 7.80mAOD. Flooding is unlikely at this level.
Is the river level rising or falling at York Castle Mills Sluices?
Based on the most recent readings, the level is currently steady. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
What is a normal level for the River Foss at York Castle Mills Sluices?
The typical range at this station is 7.51mAOD to 7.80mAOD, based on Environment Agency historical data. Levels above 7.80mAOD are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.
Embed this gauge on your website
Free live river-level widget — ideal for parish councils, angling clubs and local sites. Updates automatically.
Preview
📮 Flood risk by postcode near this gauge
Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:
FloodRadar
Log inCreate free account