If you’ve spent any time on Lake Lewisville, you’ve probably seen it without even realizing how massive it really is. The Lake Lewisville Dam isn’t just a small wall holding back water — it’s a huge piece of North Texas infrastructure that plays a major role in flood control, water storage, and recreation.
So how big is the dam in Lake Lewisville? Let’s break it down in simple numbers.
✅ Quick answer: The Lake Lewisville Dam is about 32,888 feet long (6.23 miles) and 125 feet tall.
The Lake Lewisville Dam Size in Real Numbers
The official stats on the Lake Lewisville Dam (also known as the Garza-Little Elm Dam) show it’s much larger than most people expect.
✅ Dam length
32,888 feet long (including the spillway)
That’s about 6.23 miles — which means if you could walk the top of the Lake Lewisville Dam end-to-end, it would feel like a full workout.
✅ Dam height
125 feet high above the streambed
That’s roughly the height of a 10–12 story building, depending on floor height.
✅ Width at the top (crown)
20 feet wide at the crown
This is the top of the dam — basically the “ridge line” across it.
✅ Top elevation
560 feet above mean sea level
This matters mostly for engineers, flood planning, and spillway design, but it’s part of the official Lake Lewisville Dam measurement.
How Big Is the Spillway at Lake Lewisville?
The Lewisville Lake spillway is what safely releases excess water during high lake levels and storm events.
The Lake Lewisville spillway measures:
- 560 feet long
- Spillway crest elevation: 532 feet
If you’ve ever seen the lake extremely high after big rains, this is one of the most important parts of the entire system.
Why the Lake Lewisville Dam Matters So Much in North Texas
Lake Lewisville wasn’t created just for boating and fun weekends (even though that’s what most people love it for). It was built to help manage major water events in a fast-growing part of the DFW Metroplex.
The U.S. Army Corps of Engineers lists Lewisville Lake as a reservoir that supports flood control, water management, and recreation — which explains why the dam is such a big deal.
And with the amount of growth around Frisco, Little Elm, The Colony, and Lewisville, the dam’s ability to control water flow has become even more important over time.
Quick Facts About the Lake Lewisville Dam
Here are the key numbers people care about most:
✅ Length: 32,888 feet (about 6.2 miles)
✅ Height: 125 feet above streambed
✅ Spillway length: 560 feet
Seeing the Lake Lewisville Dam From the Water Hits Different
The funny thing is… when you’re out on the lake, the Lake Lewisville Dam can look almost “normal” until you remember it stretches over six miles.
That’s one reason Lake Lewisville stays so popular year-round: it’s a huge North Texas lake with huge scenery, especially around golden hour.
And if you ever want to enjoy the water without dealing with launching, loading, or cleaning up afterward, we do offer boat rentals on Lake Lewisville that make it easy to just show up and have a great day on the water. Check out our boat and yacht rentals here.
Final Answer: So How Big Is the Dam in Lake Lewisville?
The Lake Lewisville Dam is approximately:
- 32,888 feet long (including the spillway)
- 125 feet tall
Which makes it one of the largest and most impressive structures in the entire area — even if most people only think about it when the lake is high or they’re driving nearby.
If you’re local, it’s one of those “hidden in plain sight” landmarks that’s way bigger than it looks.