Lock 27
Dive site · United States
Is it worth the trip?
64Good out of 100 for your dates
Best on Fri 6: Fresh water (a lake, river or quarry): no sea, so scored on wind and rain only, Wind 1 kn
Mon 2 · 63 out of 100
- Wind
- 8 kn
- Gusts
- 14kn
- Rain
- 0 mm
- Air
- 16°C
Tue 3 · 63 out of 100
- Wind
- 6 kn
- Gusts
- 10kn
- Rain
- 3.4 mm
- Air
- 13°C
Wed 4 · 63 out of 100
- Wind
- 6 kn
- Gusts
- 11kn
- Rain
- 0 mm
- Air
- 19°C
Thu 5 · 63 out of 100
- Wind
- 8 kn
- Gusts
- 13kn
- Rain
- 6.3 mm
- Air
- 16°C
Fri 6 · 65 out of 100
- Wind
- 1 kn
- Gusts
- 6kn
- Rain
- 0 mm
- Air
- 17°C
Sat 7 · 63 out of 100
- Wind
- 7 kn
- Gusts
- 15kn
- Rain
- 0.3 mm
- Air
- 6°C
Sun 8 · 64 out of 100
- Wind
- 5 kn
- Gusts
- 14kn
- Rain
- 0 mm
- Air
- 7°C
Tap a day for wind, gusts and rain. Full forecast
Forecast: next 10 days
Full forecast- Sun 164, good
- Mon 263, good
- Tue 363, good
- Wed 463, good
- Thu 563, good
- Fri 665, good
- Sat 763, good
- Sun 864, good
- Mon 964, good
- Tue 1065, good
The site in four facts
- Down to 10 mits deepest
- From a boathow you get in
- Advancedand up
- Fresh watera lake, quarry or spring
Full forecast
every day, every number
The score doesn't know currents, the visibility on the day or your certification.
Fresh water: lake, river or quarry: scored by other rules.
Fresh water has no waves to forecast, so the 39 points out of 100 that a sea site gets for a calm sea are given in full. The day turns on the wind (20 points) and the rain (6); gusts of 30 kn or more still score it nothing.
No satellite reads a lake's clarity or its water, so its day is its surface alone: 65 of 100, where a sea site also scores up to 20 for how far you see and 10 for warm water (D275).
No sea temperature is read for it: nothing forecasts a lake's water, and it is often much colder at depth than at the top. Ask a dive centre what suit to bring.
Suits Advanced divers and up, as a dive guide states it. Scored for Advanced divers.
| Day | Score | Wind | Gusts | Rain | Air |
|---|---|---|---|---|---|
| Sun 1Nov | 64, good | 5 kn | 10kn | 0 mm | 13°C |
| Mon 2Nov | 63, good | 8 kn | 14kn | 0 mm | 16°C |
| Tue 3Nov | 63, good | 6 kn | 10kn | 3.4 mm | 13°C |
| Wed 4Nov | 63, good | 6 kn | 11kn | 0 mm | 19°C |
| Thu 5Nov | 63, good | 8 kn | 13kn | 6.3 mm | 16°C |
| Fri 6Nov | 65, good | 1 kn | 6kn | 0 mm | 17°C |
| Sat 7Nov | 63, good | 7 kn | 15kn | 0.3 mm | 6°C |
| Sun 8Nov | 64, good | 5 kn | 14kn | 0 mm | 7°C |
| Mon 9Nov | 64, good | 3 kn | 7kn | 0 mm | 9°C |
| Tue 10Nov | 65, good | 2 kn | 10kn | 0 mm | 9°C |
Wind and gusts are in knots, rain in mm. More
Forecast updated . It refreshes every three hours. Forecast data: ECMWF, DWD, Météo-France and NOAA, served by Open-Meteo.com (CC BY 4.0). Changed by us. Generated using E.U. Copernicus Marine Service Information.
Map
the site and its town
Lock 27 on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
The map needs JavaScript. Every place on it is listed on this page, and each place's page links to Google Maps.
One finger scrolls the page; two fingers move the map. Pins are our own positions. Map OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.
More diving near here
3 places
- Wreck Wee Hawk 0.1 km away
- The Conestoga 0.5 km away
- Rothesay (Shipwreck) 13.3 km away
About
the place in full, sources, credits
About Lock 27
A reef dive in fresh water: a lake, quarry or spring. It goes down to 10 m. You get in from a boat. It suits Advanced divers and up, as a dive guide states it. No dive centre within 50 km on the map: book a liveaboard or a boat from further off. The town to stay in is Prescott. Within 5 km we also list 2 dive sites.
- Water Fresh water: a lake, river or quarry, not the sea. It is scored on its wind and rain only.
- What it is Reef.
- How deep Down to 10 m.
- Getting in From a boat.
- Who it suits Suits Advanced divers and up, as a dive guide states it.
- Dive centres No dive centre within 50 km on the map: book a liveaboard or a boat from further off.
The score is the conditions only: the journey, the price and the partners never change it (how we score, how we earn).
Rough cost (estimate): about US$951–US$1,710 each
about US$951–US$1,710 each · 6 nights, 2 sharing: flights, hire car, stay, food.
Our estimate from typical public prices, not a quote: check the real prices before you book (where they come from). Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
How we worked it out
| What | How we worked it out | Each |
|---|---|---|
| Flights | return ORD to YOW, estimated from distance and season, 2 airlines on the route, with a hold bag | about US$154–US$315 |
| Hire car | 6 days, shared | about US$154–US$255 |
| Stay | 6 nights, a mid-range double, shared | about US$301–US$502 |
| Food | 7 days eating out | about US$342–US$636 |
| Total | about US$951–US$1,710 |
Guided dives are not priced yet: we have no sourced price, so it is not in it. Prices from public sources, checked in 2026.
Where to stay: Prescott
20 min by car · 5 places to stay
about US$100/nightcountry average
About Prescott its beds, food and every spot near it
About US$100 a night is our estimate of the country's average 2-star double room that month: not each town's price, and not a quote. Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 30 October 2026.
Getting there: about 6h 55m
About 6h 55m door to door from Chicago
Fly ORD → YOW, direct, then 1h 25m by road
Flights ORD → YOW on your dates · Skyscanner
An estimate, one way; the journey never changes the score.
In the water
Dives and courses in Prescott · GetYourGuideDive gear hire in Prescott · GetYourGuide
Dive centres nearby
No dive centre mapped within 50 km.
Dive centres: © OpenStreetMap contributors (ODbL). Credits
What is under the water (visibility, current, life) no free forecast gives. Ask a dive centre before you book.