Diablo East Swimming Area
Del Rio, Texas · on Walk Lake · Amistad National Recreation Area
Verified · 3 independent sources
- WATER
- reservoir
- ACCESS
- Designated swim area
- FEE
- $4
- SEASON
- Best in summer
About Diablo East Swimming Area
Diablo East is one of only two areas the National Park Service officially designates as an unsupervised swim area within Amistad National Recreation Area, a large NPS-managed reservoir on the Rio Grande near Del Rio, Texas, making it one of the park's few official places to swim. This swimming hole doubles as a developed picnic area and one of the park's busiest boat ramps. There is no entrance fee to swim or picnic here, though launching a boat requires a Lake Use Pass.
Diablo East sits on the shoreline of Amistad Reservoir (Lake Amistad), a large international reservoir shared with Mexico, within the NPS unit's picnic-area system. The area is reached via an unpaved Viewpoint Road that the park describes as offering scenic lake views, and it functions as a multi-use day-use node combining picnicking, boat launching, and swimming along the same stretch of shoreline.
Swimming at Diablo East Swimming Area
The NPS designates Diablo East as an official unsupervised swim area, meaning swimming is expected and permitted here (away from the boat ramp cove itself, which is off-limits per park rules on ramps/marinas/docks). Water temperatures range from about 54°F in winter to 86°F in late summer, making it a warm-water summer swim in a large open reservoir rather than a river or creek. No lifeguards are on duty, so it suits confident swimmers comfortable with open, sometimes boat-trafficked water.
How to get to this swimming hole
Amistad National Recreation Area is located on the US-Mexico border near Del Rio, Texas, accessible via US 277/377; Diablo East itself is reached by a park road off Highway 90 that becomes the unpaved Viewpoint Road leading to the picnic area and boat ramp.
The walk in
No real hike here. The water is a short walk from where you park. Diablo East is a drive-up site, you park at the boat-ramp/picnic-area lot and walk directly onto the shoreline; no trail or hike is involved.
Plan your visit
Bringing kids
OK with supervision
This is open reservoir swimming, not a gentle beach: NPS provides no lifeguards, warns of sudden drop-offs in parts of the lake, and explicitly discourages cliff diving as extremely dangerous. Diablo East also shares its shoreline with one of the park's busiest boat ramps, so there is real boat traffic nearby. Fine for kids with close adult supervision and life jackets, but not a shallow, contained wading spot.
Parking
Free
Diablo East is a developed day-use boat ramp/picnic area reached via the unpaved Viewpoint Road, so on-site parking exists. There is no NPS entrance fee and no separate parking fee; the $4/day-$10/3-day-$50/annual Lake Use Pass sold via an on-site automated machine applies only to launching a boat, not to parking, swimming, or picnicking.
Water clarity
Varies with season and flow
Per the NPS scuba-diving page for Amistad, underwater visibility swings by season: it can reach 40-50 feet in winter (Nov-Apr) but drops to 10 feet or less in summer (May-Oct) due to algae growth in the warmer water. Surface water temperature likewise ranges from the low 50s°F in winter to the mid-80s°F in summer, with a cooler thermocline layer below in warm months. General travel coverage separately describes Lake Amistad as known for clear, blue water, consistent with the better-visibility winter/spring conditions.
On the water
Restrictions: Non-motorized canoes and kayaks are exempt from registration and the Lake Use Pass. All motorized vessels (including trolling motors and auxiliary-powered sailboats) need Texas state registration plus a Lake Use Pass ($4/1-day, $10/3-day, $50/annual). All Texas boating regulations apply on the U.S. side; 'Clean, Drain, Dry' is required to prevent invasive species spread; life jackets are recommended for all passengers. Swimming is prohibited in harbors, within 200 feet of fishing docks, near mooring areas, and at boat ramps. As of the most recent NPS conditions check, the Diablo East boat ramp was open with restrictions (one side closed to all craft) due to historically low reservoir levels, conditions should be verified before a visit.
NPS materials found do not specifically address paddleboards or personal watercraft (jet skis) at Amistad, so those are left unconfirmed rather than assumed allowed or banned. Water skiing is permitted but visitors must bring their own equipment; no commercial ski services are noted.
Diablo East Swimming Area: FAQ
Does Diablo East Swimming Area charge a fee?
No entrance fee to swim or picnic at Diablo East. A Lake Use Pass is required only for launching a boat: $4 for a 1-day pass, $10 for 3 days, or $50 annually, purchasable via an automated fee machine on-site, at the visitor center, or on Recreation.gov.
Is Diablo East Swimming Area kid friendly?
This is open reservoir swimming, not a gentle beach: NPS provides no lifeguards, warns of sudden drop-offs in parts of the lake, and explicitly discourages cliff diving as extremely dangerous. Diablo East also shares its shoreline with one of the park's busiest boat ramps, so there is real boat traffic nearby. Fine for kids with close adult supervision and life jackets, but not a shallow, contained wading spot.
Do I need to hike to reach Diablo East Swimming Area?
No significant hike is required. The swimming area is close to parking and access.
Where do I park for Diablo East Swimming Area?
Diablo East is a developed day-use boat ramp/picnic area reached via the unpaved Viewpoint Road, so on-site parking exists. There is no NPS entrance fee and no separate parking fee; the $4/day-$10/3-day-$50/annual Lake Use Pass sold via an on-site automated machine applies only to launching a boat, not to parking, swimming, or picnicking.
Can I bring a kayak or paddleboard to Diablo East Swimming Area?
NPS materials found do not specifically address paddleboards or personal watercraft (jet skis) at Amistad, so those are left unconfirmed rather than assumed allowed or banned. Water skiing is permitted but visitors must bring their own equipment; no commercial ski services are noted.
When is the best time to visit Diablo East Swimming Area?
Late summer, when reservoir water temperatures reach up to about 86°F, per NPS; winter water drops to around 54°F.
What are the rules at Diablo East Swimming Area?
NPS designates this an unsupervised swim area but prohibits swimming in harbors, within 200 feet of fishing docks, near mooring areas, and at boat ramps; diving from cliffs is explicitly discouraged as extremely dangerous; no lifeguards are provided and swimming is at one's own risk.
What water body is Diablo East Swimming Area on?
Diablo East Swimming Area is on Walk Lake, a natural reservoir verified in USGS hydrography data.
More swimming holes near Del Rio
★ Top verifiedAmistad National Recreation Area
Del Rio, Texasreservoir
⛺🛶🏄🚤
Concan Swimming Hole
Concan, Texasriver
🛶🛟
★ Top verifiedLangford Hot Springs
Hot Springs, Texashot spring
🥾 0.25 mi hike⛺🛶🛟
★ Top verifiedHot Springs Trailhead
Big Bend National Park, Texashot spring
🥾 0.25 mi hike⛺🛶🛟
Canyon Park Swim Beach #1
Canyon Lake, Texasreservoir
⛺🛶🏄🚤
Cypress Falls Swimming Hole
Wimberley, Texascreek
🛶🏄🛟