Merced River vs Tuolumne River: Which Yosemite-Area Rafting Trip Is Right for You?

ARTA has been running guests down both the Merced and the Tuolumne since 1963. We hold permitted access on both rivers through the US Forest Service, and the Bureau of Land Management. After six decades on these two watersheds, we know them as well as anyone on the water.

If you are planning a trip to the Yosemite area and trying to figure out which river makes sense for you, this guide lays out the honest differences between the two so you can make the right call before you book.

The Short Answer

The Merced runs in spring only (April to June), and is an easily accessible road-side river. It’s an excellent choice for first-time or family groups looking for an exciting Class III and IV day on the water right outside the Park. The Tuolumne runs a much longer season (April to September), and varies in difficulty depending on when you go: Spring Tuolumne trips deliver higher water and more intense rapids, where summer-time trips deliver fun and consistent class IV family friendly whitewater. Tuolumne trips are located deep in a remote, isolated and rugged canyon near the North Entrance to Yosemite, whereas Merced rafting trips parallel the Arch Rock entrance to Yosemite off HWY 140 and can be viewed directly from the highway. 

Both trips are great trips and serve different groups, different schedules, and different appetites for whitewater. Here is how they stack up across the factors that matter most.

The Merced River: Wild, Spring-Fed, and Accessible

The Merced is a free-flowing river, meaning it runs entirely on snowmelt from the Sierra Nevada. That is what makes it special and what makes it seasonal. From April through early June, the snowmelt transforms the Merced into a fast, pushy Class III and IV river packed with roller-coaster wave trains and big crashing swells.

The river drops nearly 30 feet per mile through the foothill corridor just outside Yosemite Valley. The water is cold, clear, and moving fast. Our guides describe it as an honest spring river: it gives you what it has, which during peak flows is a lot.

Who the Merced Is Best For

The Merced is the right starting point if this is your first time in a raft or your first time on Class IV whitewater. The rapids are exciting without requiring the technical paddling skills that the Tuolumne demands. Groups of friends visiting Yosemite in April or May, families with teenagers, and anyone who wants a single-day adventure close to the park entrance will feel right at home on the Merced.

Minimum age on our Merced trips is 11 years old. The one-day format and the $190 per person starting price make it the more accessible entry point for most groups.

What to Know About the Merced Season

Because the Merced is free-flowing, the season is controlled entirely by snowpack. A heavy snow year means the river runs longer and harder. Higher water (typically when it first starts to warm up in mid May) means bigger and faster whitewater. A dry year shortens the window. ARTA runs Merced trips from April through early June. Outside of that window, the river typically drops too low to run safely.

If your Yosemite trip is happening mid-summer, the Merced is not your river. That is when you want to look at the Tuolumne.

The Tuolumne River: California’s Most Complete Whitewater Experience

The Tuolumne has more than 40 named rapids packed into 18 miles of canyon below Hetch Hetchy Reservoir. The canyon is isolated, the scenery is dramatic, and the whitewater is very very fun.

The Tuolumne is dam-controlled, which means water releases from upstream reservoirs keep the river running reliably through the summer. That gives the Tuolumne the longest season of any river in the Yosemite area.

Who the Tuolumne Is Best For

The Tuolumne is the right call for paddlers who have rafted before AND adventurous first timers. The rapids are technical, they come in quick succession, and some of them, including Clavey Falls, require scouts and real decision-making.

The Tuolumne is also the right river if you want a full-scale all inclusive multi-day wilderness trip. Our 2 and 3-day options include comfortable riverside camping, ARTA’s legendary camp kitchen (guests consistently call the food the best meals they have ever had in the wilderness), and a third-day hike to a swimming hole on the North Fork that most guests say is the highlight of the trip.

Minimum age on our Tuolumne trips is 11 years old. Starting price is $342 per person for a one-day trip.

What to Know About the Tuolumne Season

The Tuolumne runs from spring through late summer. In the high-water spring season (typically April through early June), the river runs at Class IV+ with several Class V conditions. ARTA provides wetsuits and paddling jackets for all guests and requires all spring guests to be in good physical condition, be at least 14 years old and prepared for a demanding day.

As the season progresses and flows moderate, the river becomes more suitable for a wider age range and experience level. Water and air temperature increase no longer necessitating the use of wetsuits yet the whitewater maintains its class IV rating as the river turns to a more technical nature (‘rocky and droppy’ vs. high and fast).  If your group is visiting in July or August and wants a summer river trip near Yosemite, the Tuolumne is the best option.

How to Choose Based on Your Situation

Choose the Merced if…

• Your trip is in April, May, or early June
• You are new to whitewater or introducing someone to it for the first time
• You have kids aged 11 or older in your group
• You want a single-day experience with a lower price point
• You are staying near the Hwy 140 Arch Rock entrance to Yosemite

Choose the Tuolumne if…

• Your trip is in the summer (June through August)
• You want a multi-day river camping experience
• You are looking for the absolute premier wilderness whitewater rafting experience in California 
• You want to stay near the Hwy 120 corridor through Groveland

What If You Cannot Decide?

Call us. We have been matching guests to the right river for over 60 years, and we are happy to talk through your group’s experience level, travel dates, and goals before you book. Both rivers in Yosemite are spectacular. The right one depends on when you are going and what you are ready for.

A Note on ARTA’s History on These Rivers

ARTA, the American River Touring Association, is a non-profit outfitter that has held permitted access on the Merced and Tuolumne rivers for decades. Every trip we run generates revenue that goes back into river conservation, guide training, and public land stewardship. We are not a commercial outfitter focused on volume. We are a small organization that cares deeply about the rivers we run.

Our guides are career professionals, many of whom have spent 10, 15, or 20 or more seasons on these specific waterways. When you book a Merced or Tuolumne trip with ARTA, you are getting instruction and guidance from people who know every rapid by name.

Ready to Choose?

Both rivers are exceptional. The right one comes down to your season, your experience, and what kind of day or days you are looking for.

Frequently Asked Questions

Is the Merced River or the Tuolumne River better for beginners?

The Merced River is the better choice for first-time rafters. It runs Class III and IV whitewater, which is exciting and physically engaging without requiring the technical paddling experience that the Tuolumne demands. The Tuolumne, with its 40-plus named rapids at Class IV+, is best suited to guests who have prior whitewater experience.

What time of year can you raft the Merced River?

ARTA runs Merced River trips from April through early June. The Merced is a free-flowing river that depends on Sierra Nevada snowmelt, so the season length varies by year. In heavy snow years the window extends; in dry years it may close earlier. If you are visiting Yosemite in summer, the Merced will not be running.

What time of year can you raft the Tuolumne River?

The Tuolumne River season runs from spring through late summer, typically April through August. Because the Tuolumne is dam-controlled by releases from Hetch Hetchy Reservoir, it maintains reliable flows throughout the summer. This makes it the right option for guests visiting the Yosemite area in June, July, or August.

Can families with young children raft the Tuolumne or Merced?

The minimum age for ARTA Merced River trips is 12 years old. The minimum age for ARTA Tuolumne River trips is 11 years old. Both rivers require guests to be in reasonable physical condition and comfortable being in the water. The Merced is generally the more appropriate choice for younger or less experienced family groups given its lower difficulty rating.

How long is a day trip on each river?

Both rivers offer one-day trip options. Merced one-day trips typically end around 5:00 pm. Tuolumne one-day trips run longer due to the shuttle across Don Pedro Reservoir at the end, with typical return times between 6:00 and 7:00 pm. The Tuolumne also offers 2 and 3-day multi-day options with riverside camping; the Merced is a one-day trip only.

How far are these rivers from Yosemite Valley?

The Merced River meeting point in Midpines is approximately 45 minutes from Yosemite Valley via Highway 140. The Tuolumne River meeting point in Groveland is located along Highway 120, roughly a 3 and a half hour drive from the San Francisco Bay Area. Both rivers are within a comfortable drive for guests staying inside or near the park.

Do I need prior rafting experience for either river?

No prior experience is required for the Merced River. It is designed to be accessible for first-time rafters with good physical fitness. The Tuolumne River is more appropriate for guests with some prior whitewater experience. If you are new to rafting and considering the Tuolumne during the high-water spring season, please call us to discuss your group before booking.

What is included in an ARTA Merced or Tuolumne river trip?

All ARTA river trips include professional guide service, transportation to and from the launch site, a riverside lunch, and all safety equipment including life jackets and helmets. Wetsuits and splash jackets are provided when conditions require them. Multi-day Tuolumne trips also include all meals from day one lunch through final day lunch, camping gear including sleeping pads and tents, and all government access fees.