If you live in Newcastle, you already know the sound of Coal Creek before you can see it. The trail that follows it has been the city's unofficial spine since the last mine closed in 1963, connecting Cougar Mountain to Lake Washington through a ravine that once carried the region's first railroad. This summer, that spine is being physically rebuilt beneath your feet, and the change has quietly rewritten how residents actually use the corridor.
The short version: your favorite trailhead may be closed, the parkway drives differently than it did a year ago, and the walk itself has a new front door.
The trailhead that isn't there
The Red Cedar Trailhead off Coal Creek Parkway SE, the one most Newcastle residents used for a quick after-work loop, is behind chain link. It will stay that way for a while. The Red Cedar Trailhead is an active construction site and will close for approximately three years while King County's Wastewater Treatment Division replaces a regional sewer line originally built between 1966 and 1991.
The project is not small. Crews are building about 2 miles of new sewer pipe and moving the active pipeline away from Coal Creek's environmentally sensitive areas. The method is the noisy part. Tunneling began at the Red Cedar Trailhead as soon as July, and once it begins, tunneling runs 24/7 to ensure smooth and safe operation. If you have wondered why there are lights on at odd hours near the parkway, that is why.
There is one grace note. The rebuilt Red Cedar Trailhead will retain the same look-and-feel while enhancing accessibility for visitors of all abilities when the work is done, so the place you remember will still be the place you come back to.
The new front door is a trail most residents haven't tried
While Red Cedar is offline, the corridor is very much open, just from different directions. Other trailheads such as the Forest Drive, Coal Creek Family YMCA, Cinder Mine, and Red Town trailheads are open. The one worth knowing about, if you have not used it yet, is Cinder Mine.
Pass a sign for the Cinder Mine Trail, a newly built 0.3-mile trail that leads to a small parking area off Newcastle Golf Club Road. That short spur has become the practical replacement for Red Cedar. It provides access to the Coal Creek Trail via the Cinder Mine Trail, as well as North Fork Falls. To access the falls, walk from the parking lot down the Cinder Mine Trail to the bottom. Turn right onto the Coal Creek Trail and, in about 0.2 miles, North Fork Falls will appear on your left.
From that same trailhead you can also loop up into Cougar Mountain Regional Wildland Park. A word of warning for August visitors: the waterfall is still dry with only a few trickles/streams in sight in some years, so if the falls are the point, this walk rewards spring more than late summer. Come now for the forest and the history instead.
What you are actually walking past
Coal Creek is a museum you happen to be exercising in. Between Red Town and the parkway, the ravine holds the physical residue of a company town that produced enough coal to name the neighborhood. Back in 1863, coal was discovered along Coal Creek, and over the next 100 years miners would pull 11 million tons of coal from the slopes of Cougar Mountain before the mines were sealed in 1963. All that coal prompted folks to dub the area "Newcastle Hills," after England's coal-rich city of Newcastle.
The relics are easy to miss unless you know where to look. Walking east to west from the Red Town side:
- The sealed mine shaft, a short distance in from the Red Town Trailhead, still smells faintly of coal if you stand close.
- North Fork Falls, with log benches rust colored from the iron salts leached from coal.
- The locomotive turntable footing, an unremarkable-looking 8-by-8-foot concrete pad on the left about 400 feet past the Cinder Mine sign, once used to spin locomotives 180 degrees.
- Sandstone Falls and a pair of coal car axles along the Primrose Trail spur, which is only slightly longer, about 0.1 miles, than staying on the Coal Creek Trail, and connects back up with the Coal Creek Trail after roughly 0.7 miles.
- Cave holes on the Cougar Mountain side, where "cave holes" were formed when miner's underground extractions got too close to the surface, which eventually led to cave-ins. Stay on the marked route.
For context on how busy this ravine once was, consider a single year: in 1917, this multiethnic community of 1,000 people produced 360,000 tons of coal. The Seattle and Walla Walla coal trains carried their loads to the coal docks, where the coal was shipped to San Francisco. The forest has grown back over most of it, which is the strange pleasure of the walk. You are inside an industrial site that has been almost completely reclaimed.
The parkway drives differently now
If the trail feels different, the road above it does too. Coal Creek Parkway SE runs the length of the corridor, and Bellevue finished a set of safety changes on its stretch this spring. Construction of the radar feedback signs, and installation of new speed limit signs and curve warning signs, was completed in May 2026. The reason is not abstract. Coal Creek Parkway SE is part of the city's High Injury Network, a grouping of streets on which most fatal and serious injury crashes in Bellevue occur. At least nine serious-injury crashes and one fatal crash have occurred on Coal Creek Parkway SE between Factoria Boulevard SE and the south city limits since 2016.
The practical effect for Newcastle drivers is a lower posted speed and more radar feedback signs on the Bellevue side of the border near Newcastle Commons Drive. Layered on top of that, King County's sewer work brings its own rhythm: crews are tunneling for the new sewer line 24/7, with Coal Creek Parkway SE southbound single-lane closures 6 a.m. to 3 p.m. and northbound single-lane closures 10:30 a.m. to 7:30 p.m. near Forest Drive SE. If your morning commute takes you north through the parkway, the middle of the day is now the harder window, not the peak.
Where to land after
The best part of walking Coal Creek from the Newcastle side is that you can end the loop with a real meal without getting back in the car for long. From the Cinder Mine or Red Town side, the closest indoor sit-down with a view is the Calcutta Grill at The Golf Club at Newcastle, which nestled 900 feet above the Sound, offers a selection of the Pacific Northwest's favorite foods with a breathtaking view across Lake Washington toward Seattle.
If you started from the west end near the parkway, Coal Creek Marketplace and The Shops at Newcastle Commons put you within a few minutes of neighborhood standards like Tapatio Mexican Grill and the small sushi counter at Newcastle Commons. These are the everyday places you know. The point is not the recommendation, it is that the trail actually connects to them by foot and short drive, which is unusual for a forested hike inside King County.
One date to hold: September 19
The other reason to time a late-summer walk is that the city's biggest day of the year is coming. Newcastle Days lands on Saturday, September 19, 2026, from 10:00 a.m. to 7:00 p.m. at Lake Boren Park at 13058 SE 84th Way. It is free, it is walkable from most of central Newcastle, and it exists because the festival is held in September to honor Newcastle's official cityhood in 1994.
Here is what past years suggest the day will look like:
| Time | Where to be |
|---|---|
| 8:00 a.m. – 12:00 p.m. | Jim Price Memorial Pickleball Tournament |
| 10:00 a.m. – 3:00 p.m. | Cars on the Green auto show, Newcastle Cemetery Open House |
| 10:30 a.m. | Parade led by bagpiper Neil Hubbard, opening ceremony |
| 11:00 a.m. – 5:00 p.m. | Live entertainment, community booths, inflatables |
| 11:00 a.m. – 7:00 p.m. | Food vendors and craft beer & wine garden |
| 5:30 – 7:00 p.m. | Grand finale concert |
The booth roster is worth scanning too. You will find Newcastle Arts Council, Newcastle Library, Newcastle Historical Society, and the Hazen and Liberty Robotics Teams, alongside pony rides and a petting zoo, with the beer and wine garden hosted by the Greater Newcastle Chamber of Commerce.
The bigger point
The stretch between the sealed mine shaft and Lake Boren Park is about six miles as the crow flies, and this summer almost every element of it is under some kind of active care. A regional sewer is being tunneled beneath the ravine. A parkway is being slowed down. A trailhead is being rebuilt. A festival is being staged at the park in the middle. For a city that most of the region drives past on the way to somewhere else, that is a surprising amount of attention landing at once, and it is landing on the things residents actually use every day.
If you are thinking about your own place in Newcastle, whether that is a first home near Coal Creek Parkway, a move-up house on the Cougar Mountain side, or a plan for what comes next, Tom and Rebecca are happy to walk the neighborhood with you. Contact us anytime.
