Metcalfe Rock Spring, The Blue Mountains, Ontario, Canada

## Overview Metcalfe Rock Spring is a natural spring located within the scenic Metcalfe Rock area of The Blue Mountains in Grey County, Ontario, Canada. Nestled along the Niagara Escarpment — a UNESCO World Biosphere Reserve — this spring draws visitors with its striking blueish-purple violet hue, a distinctive coloration that is believed to result from the water's journey through ancient underground glacial deposits in the region. The Niagara Escarpment's layered dolostone and limestone bedrock, formed hundreds of millions of years ago, filters and mineralizes groundwater in ways that can produce unusual visual and chemical characteristics. The spring is accessible year-round, 24 hours a day, 365 days a year, and sits just a short walk from the parking area near 10th Line in Thornbury, Ontario. While the water has historically attracted visitors interested in natural spring water, at least one independent water sample taken at the site tested positive for both Total Coliform bacteria and E. coli bacteria. The submitter who collected that sample reported no serious side effects from consumption, but visitors should be aware of these findings and exercise caution. Additional water sampling over time is encouraged to better understand the spring's water quality, as conditions can change seasonally. The spring's TDS (Total Dissolved Solids) level is reportedly higher than some other well-known Ontario springs, such as the Kearney Natural Spring, which may contribute to its unique color and mineral profile. ## Directions 1. Navigate to **415508 10th Line, Thornbury, ON N0H** (or nearby address 415477 10th Line) using GPS coordinates **44.41861, -80.444328**. 2. Park at the designated parking area near the trailhead. 3. Follow the marked trails from the parking area for approximately **3 minutes** on foot. 4. You will reach a **wooden bridge** — cross it to arrive at the spring. 5. **Tip:** If you plan to collect water in large glass bottles, consider bringing a cart or carrying device, as the trail may be uneven. ## What to Expect The spring is set within the forested landscape of the Niagara Escarpment, offering a peaceful natural setting surrounded by mature hardwood and mixed forest. The short trail from the parking area is relatively easy and leads to a wooden bridge that provides direct access to the spring. The water itself is visually remarkable — visitors have noted its distinctive blueish-purple violet color, which is unusual among Ontario springs and makes for a memorable sight (and striking photos). The coloration is thought to be linked to the ancient glacial geology underlying the area. The spring flows year-round, though water volume and clarity may vary with the seasons. Spring and fall can bring muddy trail conditions, so sturdy footwear is recommended. In winter, the trail and bridge may be icy. Because the spring is located in a natural, unmanaged environment, the water is not treated or monitored by any municipal authority. Past testing has detected coliform and E. coli bacteria in at least one sample, so visitors who choose to collect water should be aware of this and may wish to treat or filter the water before use. The Metcalfe Rock area is also popular with hikers and rock climbers exploring the Niagara Escarpment, so the spring can be combined with a broader outdoor adventure in the Blue Mountains region.