What?

Oregon’s Highway 138 (OR-138), widely known as the Highway of Waterfalls and designated along its core section as the Rogue-Umpqua Scenic Byway. The route tracks the North Umpqua River as it plunges from alpine volcanic high country down into deep, mossy temperate rainforest gorges filled with massive Douglas firs, giant ferns, rushing white water, natural cliffside hot springs, and more than 15 accessible waterfalls.

The sheer concentration of waterfalls within a few dozen miles is geological: roughly 7,700 years ago, the cataclysmic collapse of Mount Mazama (which birthed Crater Lake) blanketed the entire upper North Umpqua basin in thick deposits of basalt lava, volcanic tuff, and pumice. As the North Umpqua and its tributaries carved their way back down through the resistant rock layers, vertical plunges and step-cascades formed at every hard basalt threshold and tributary confluence. Beneath this volcanic crust, geothermal heat still simmers, feeding mineral-rich natural steam pools hanging high on the river canyon walls.

Where?

Southern Oregon, stretching roughly 80 miles (130 km) along Highway 138 between Diamond Lake at the eastern, high-elevation alpine boundary (5,180 ft / 1,580 m) near Crater Lake and Mount Thielsen, down to the city of Roseburg at the western valley floor (460 ft / 140 m) along Interstate 5.

When?

Highway 138 is open year-round, but conditions change dramatically across the 4,700-foot elevation drop:

Summer (July to Mid-September): The most accessible window for hiking trails, swimming in plunge pools, and backcountry dirt roads. Roseburg reaches 82–93°F (28–34°C), while higher elevations near Diamond Lake remain pleasant at 72–79°F (22–26°C) by day and drop to 46–54°F (8–12°C) at night. Heads up: Late summer can bring regional wildfire smoke into the river corridor, so verify local air quality (AQI) before heading out.

Fall (Late September to October): Exceptional photography conditions. Crowds disappear completely, and bigleaf maples along the riverbanks flare into fiery yellow and orange against dark evergreens and basalt. Autumn rains begin returning, recharging waterfall volume.

Winter and Spring (November to June): The falls run at absolute peak roar and power, throwing heavy drenching clouds of mist into the canyon bases. While low elevations stay rainy and above freezing, upper elevations around Diamond Lake receive heavy snowpack. OR-138 is plowed and kept open, but unpaved secondary forest access roads (like the route to Lemolo Falls) often remain snowed-in or deeply rutted with mud well into May or early June. Soaking in the steaming Umpqua Hot Springs in pouring rain or falling snow is unforgettable, but trails get slick.

Tips and inputs:

Dead Cellular Zone: Cell coverage cuts out completely once you drop below Diamond Lake and stays disconnected for nearly 50 miles until you approach Glide. Download offline maps on Google Maps, CalTopo, or AllTrails before leaving the city. Brown USFS trail signs mark waterfall turnoffs, but offline GPS is essential for forest side spurs.

Fuel Scarcity: Gas stations exist only at the far ends: Diamond Lake Resort to the east, and Glide/Roseburg to the west. There are zero working gas pumps along the 60-mile canyon run. Top your tank completely before diving in.

Self-Contained Food & Water: Outside of Diamond Lake Resort and a seasonal small snack spot near Toketee Lake, you will find no grocery stores, food trucks, or cafes along the highway. Pack a cooler with lunch fixings, fruit, energy snacks, and plenty of water for trailhead picnics.

Footwear Matters: Trail tread throughout the Umpqua rainforest is slick with mud, exposed wet roots, and damp basalt slabs. Leave slick city runners behind; aggressive-traction trail runners or hiking boots are mandatory for safety.

Waterproof Shell & Camera Protection: Waterfalls like Watson and Lemolo generate thick, soaking spray zones that will drench you within minutes even on blue-sky days. Carry a good rain shell and pack dry bags and microfiber cloths to wipe camera lenses right before shooting.

Hot Springs Culture & Etiquette: Umpqua Hot Springs follows a standard Pacific Northwest backcountry clothing-optional tradition. Expect many visitors to soak in natural nudity. Swimsuits are totally welcome, but keep this in mind if visiting with kids. Glass containers are strictly prohibited, quiet voices are respected, and you must pack out every scrap of trash back to the parking lot.

Passes & Parking Fees: Day-use trailheads under USFS management (such as Umpqua Hot Springs) require a $5 cash fee at the self-pay kiosk or the display of an interagency America the Beautiful pass on your dash.

My thoughts:

Most travelers treat Highway 138 simply as a transit highway between Crater Lake, central Oregon, and the Pacific Coast, rushing through to reach their hotel. That is a mistake. This corridor deserves a dedicated full day, or better yet, two days with a forest camp, to soak in the mist, scramble the canyon bottoms, and experience the raw power of the Cascade rainforest.

The visual contrast across this drive is unmatched: you start looking up at the sharp, lightning-scarred spire of Mount Thielsen, plunge into gloomy, primeval green canyons filled with century-old engineering relics, soak in geothermal pools suspended over a roaring river, and finish where two distinct rivers crash head-on. As the old saying goes, "I feel lucky. The harder I work, the luckier I get." If you wake up at dawn, do not fear a little Pacific Northwest drizzle, and put in the trail miles, Highway 138 delivers some of the best wild scenery in North America.

The visit:

The route runs East to West, descending from the high volcanic plateau down to the valley. (It works just as well in reverse if you are climbing inland from I-5 or the coast.)

1. The High Alpine Gateway: Diamond Lake & Lemolo Lake

The route begins at 5,180 feet in the mountain basin of Diamond Lake. Facing east across the water, the jagged, 9,184-foot volcanic pinnacle of Mount Thielsen dominates the horizon. Known as "The Lightning Rod of the Cascades" because its sharp basalt spire constantly attracts electrical strikes during summer storms, its reflection in the morning water is stunning.

Dropping slightly down Forest Road 2610 brings you to Lemolo Lake (4,130 ft), a reservoir created by damming the North Umpqua.

The Lemolo Dam & Flume: Forest Road 2610 crosses right over the crest of Lemolo Dam No. 1. From here, a major portion of the river is diverted into an open concrete canal and enormous pipeline running along the canyon wall to the Lemolo No. 1 Powerhouse, generating hydroelectric power before returning to the riverbed above Lemolo Falls.

White Mule Trail: A remote, quiet trail tucked into the woods with virtually no crowds. The moderate 2-mile walk winds through green moss and flowing springs, terminating at the brink of a sheer basalt cliff with a birds-eye view looking down on Lemolo Falls as it plunges into a narrow canyon. Looking closely from above, you can spot hikers at the bottom along the opposite bank—a clear preview for the next scramble.

Warm Springs Falls: A quick stop further along the forest roads. An easy, gentle walk of less than 0.5 miles leads to a wooden viewing platform facing Warm Springs Falls, where water drops 95 feet (30 m) into a tight rock bowl hemmed by basalt pillars and dense foliage.

Camping the High Woods: On my own trip through this corridor in May 2026—following a long 300-mile push from the eastern Oregon desert up through Crater Lake's snow banks—pitching camp under the massive firs near Poole Creek Campground by Lemolo Lake provided complete quiet. The deep woods shelter you from ridge winds, night rain ticking against pine needles sets the mood, and sleeping early positions you at the trailheads before anyone else arrives.

2. The Heart of the North Umpqua: Hot Springs & Toketee Falls

Dropping back onto Highway 138 puts you within minutes of the corridor's crown jewels.

Umpqua Hot Springs: Mineral water seeps from volcanic bedrock at 108–110°F (42–43°C), spilling across natural travertine terraces that cascade down a steep bluff above the roaring North Umpqua River.

The Trail: From the parking area on FR-3401, cross the river footbridge and tackle the short, steep 0.5-mile trail. Wet weather makes the muddy roots extremely slick.

The Experience: The upper pool sits right at the source and runs hottest, while each lower pool cools slightly. Getting here at 7:00–8:00 AM on a crisp, drizzly morning gives you utter silence, rising steam blending with cold raindrops, and complete isolation before crowds arrive by midday.

Toketee Falls & The Redwood Flume: Originating from the Chinook word for "graceful" or "pretty," Toketee is a geological masterwork.

The Redwood Flume: Right at the trailhead parking area, you walk past a 1950s engineering marvel: a massive, 12-foot-diameter water conduit built entirely from redwood staves bound with steel tension bands like an oversized wine barrel. Water sprays through micro-crevices under pressure, sustaining its own coat of green moss in the forest shade.

The Falls & Basalt Columns: The 0.8-mile round-trip trail climbs well-maintained wooden stairs along the gorge to a railed viewing deck. Toketee drops 120 feet in two tiers (a 40-foot upper cascade and an 80-foot lower plunge) directly through a notched opening carved out of perfectly straight, vertical columnar basalt that looks like giant church pipe organs. The water dumps into an emerald-turquoise pool below.

The Bottom Scramble (Experienced hikers only): Next to the platform, an unofficial, near-vertical fisherman's path drops down the cliff face using tethered ropes. It is slick, muddy, and genuinely dangerous, but reaching the bottom leaves you standing on river stones right beneath towering hexagonal basalt columns, drenched in thunderous, ice-cold mist.

3. The Central Falls Cluster

Within a short drive west from Toketee:

Watson Falls: About 2 miles west of Toketee, this is the third-highest waterfall in Oregon, plunging an astonishing 272 feet (83 m) sheer off a massive basalt amphitheater. Even if upper bridge maintenance closes the loop, the short walk through the moss-covered boulder field at the base gives a great view of the drop.

Slide Creek Falls: An intimate, less-visited stepped fall cascading over slick bedrock shelves beneath dense conifer shade.

Fall Creek Falls: A trail under a mile long that cuts through a rocky gorge showing traces of the Archie Creek Fire, where charred tree snags stand beside vibrant new fern growth. The trail ends at a 115-foot two-tiered fall dumping into an icy, crystal-clear wading pool.

4. The Lower Run: Steamboat to Glide

Descending lower toward Roseburg, the elevation drops below 1,000 feet, the climate warms, and the narrow basalt canyon opens into broader valleys:

Steamboat Falls & The Fish Ladder: Turning onto Road 38 at Steamboat brings you to a wide, churning 25-foot waterfall with an excellent summer swimming hole. Right beside the drop is a historic concrete-and-rock fish ladder. In summer and fall, you can stand directly above the pool and watch wild steelhead and salmon launch themselves airborne out of the whitewater on their upstream run.

Susan Creek Falls (Milepost 29): An easy, accessible 0.8-mile round-trip trail leading to a 50-foot waterfall fanning delicately across terraced, mossy rock into a calm pool. Across the road, the short Indian Fords Trail leads to ancient Umpqua tribal vision-quest rock cairns.

Wolf Creek Falls: Accessed via Little River Road near Glide, this 2-mile round-trip path follows an unburned old-growth forest creek to a dramatic two-tiered, 125-foot drop.

Colliding Rivers at Glide: Located just behind the Glide visitor center, this is a rare hydrologic occurrence. The large North Umpqua River and the Little River meet head-on at a 90-degree angle over volcanic bedrock ledges, crashing directly into each other to create a churning white-water whirlpool.

5. Finishing in Roseburg

After Glide, Highway 138 straightens out through open oak hills and vineyards, pulling into Roseburg on the I-5 corridor. This is where you restock, refuel, and check out local Umpqua Valley breweries or boutique wineries (known especially for Syrah and Pinot Noir).

Summary and Final Thoughts:

Highway 138 connects the best contrasting environments in Oregon. From Roseburg, you can head north toward Eugene and Silver Falls, south into California toward Mount Shasta, or take OR-42 west for 90 minutes straight to Bandon and Coos Bay on the wild southern Oregon coast.

Treating this road as a destination rather than a shortcut changes your entire trip. Pack waterproof layers, get an early start at Umpqua Hot Springs, bring sturdy boots for the wet basalt trails, and give the North Umpqua River the full day it deserves.