River Wharfe at Grassington

Monthly water temperature temperature

The surface runs about 16.5 °C in August. The annual low is 5 °C in January and the high is 16.5 °C in July. No pronounced summer thermocline is recorded here. For October, the mean surface figure is 11.5 °C.

Mean water temperature by month (°C)

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
5	5	6.5	9	12	15	16.5	16.5	14.5	11.5	8	6

Safety safety

The Wharfe at Ilkley became England's first river with designated inland bathing-water status in 2021. Grassington is upstream of the main Ilkley sewage discharges, and EA sampling here has consistently returned Good or Excellent.

Safety notes (3)

• Limestone pavement in the Dales has deep grykes — open fissures up to a metre wide. Wade the riffle slowly; the gaps are invisible in rippled water.
• The Wharfe responds to rain within two hours. A downpour in Kettlewell puts the Grassington riffle under 60 cm of fast brown water.
• Weil's disease is a genuine concern in the Dales' rat population. Never swim with open cuts, and shower within an hour.

Where to get in

• Limestone riffle — Upstream of the bridge, right bank. Flat bedrock with good grip even when wet.
• Grass bank step-down — Downstream meadow bank; a 40 cm step from grass straight into 1.5 m — the quickest entry and the one most people use.

On site

• Cafés and two pubs in Grassington square, 8 minutes' walk
• Public toilets (20p) at the car park
• No lifeguard; nearest A&E is Airedale, 35 minutes by road

Getting there arrival · entry · exit

Getting there

Park at the National Park car park and walk south past the devils' waterworks, following the Dales Way signposts. The swimming riffle is the first place the path actually meets the water, about 8 minutes down.

Alternatively come in from Linton Falls — a 15-minute walk upstream through the falls viewing platform, which gives you a useful read on the flow before you commit.

Getting in

Enter from the grass bank downstream. A single 40 cm step puts you in 1.5 m of clear water over flat bedrock, and there is no undercut within 5 m of the bank.

The swim is a 25 m diagonal to the bridge pool and back. In August the riffle reads 17 °C and the pool 15 °C — the pool is noticeably colder because it is spring-fed through the limestone.

Wear river shoes. The bedrock is smooth but broken into slabs with 5–10 cm gaps, and a stubbed toe here ends the day.

Getting out

The grass bank is the easiest exit — no step, no slip. Climb out on the downstream side so you are already walking away from the bridge pool's current.

Grassington square is 8 minutes uphill and all of it is exposed. Windproof layer first, then walk; the Dales wind at 15 °C after a swim feels like a different season.

Depth profile

A classic Dales profile: 200 m of ankle-to-waist limestone riffle, then a sudden 3 m scour pool where the bridge pier deflects the flow. The pool edge is undercut on the far bank — the bank overhangs the water by about half a metre, which is where the depth is greatest.

Season window

Late May to September; the Dales are 2–3 °C cooler than the national average

Cold-water questions

Was the Wharfe really England's first bathing river?

Yes — the Ilkley stretch was designated in 2021 under the Bathing Water Regulations, the first inland river in England to receive the status.

Is sewage still discharged into the Wharfe?

Storm overflows do operate in the catchment, mostly downstream at Ilkley and Addingham. Grassington sits above them, which is why its sampling record is stronger.