Where is Lewisville Lake?

Lewisville Lake is a lake in Denton County, Texas. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.

Are there boat ramps on Lewisville Lake?

Lewisville Lake has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Tower Bay Park, Lewisville City Park, Lewisville City Park, Oakland Park, among others. Public access is listed as yes.

Lewisville Lake

Denton County, Texas23,280 acresView map Directions

Nutrient-rich

Nutrients and algae run above the regional average.

↓ down from C at the last regrade

Water temp

No gauge

Clarity

1.8 ft

Secchi · sampled 2026

Level

No gauge

Trend

Stable

4 years of samples

Eutrophic
#1 of 6 in the county
Public access

See the measurements Directions Where to stay

Lewisville Lake in Denton County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 1.8 ft visibility. Phosphorus: 43 µg/L. Chlorophyll-a (algae): 26.8 µg/L. Surface area: 23280 acres.

Clarity: 1.8 ft
Area: 23,280 acres
Type: Eutrophic
Phosphorus: 43 µg/L
Chlorophyll-a: 26.8 µg/L
Trend: → Stable
Public access: Yes

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Stays via Stay22

Stays near Lewisville Lake

Compare lakeside cabins, hotels, and vacation rentals near Lewisville Lake in Denton County, Texas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Lewisville Lake are listed below.

Top-rated places to stay near Lewisville Lake

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Watch Lewisville Lake’s letter

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Lewisville Lake is a 23,280-acre productive, nutrient-rich eutrophic lake in Denton County, Texas. Water quality is graded D based on 2 sampling years through 2026. Limited fish-species data available. Public access is available with 5 public boat landings. Compared to the 5 other monitored lakes in Denton County, Lewisville Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2026-01-13. Grade methodology: LakeQuality methodology.

What Lewisville Lake is good for

From access and monitoring records, not editorial picks.

Boat launch5 documented ramps
Big water23,280 acres

Swimming Safety

Grade only

Algae risk

Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.

The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.

Get alerts for Lewisville Lake →

Water Quality Grade: D (Nutrient-rich)

Very murky, less than 1.8 ft of visibility. Phosphorus 43 µg/L. Chlorophyll-a 26.8 µg/L. TSI 63. The letter is not a swimming clearance.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.8 ft	Not graded
Phosphorus	43 µg/L	Fair
Chlorophyll-a (Algae)	26.8 µg/L	Poor
Trophic State Index (TSI)	63	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Surface Area	23,280 acres
Public Access	Yes

No bathymetric survey has been published for Lewisville Lake, so its depth is not documented here.

Recreation & Access

Boat Landings

Yes

Public Access

Tower Bay ParkPublic
Lewisville City ParkPublic
Lewisville City ParkPublic
Oakland ParkPublic
Eagle Point MarinaSemi-private

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Fishing Lewisville Lake

→ Lewisville Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: → Stable

Based on 4 years of monitoring data (2020-2025).

Metric	Trend	Change/Year	Years
Water Clarity	→ Stable	-0.035 m/yr	4
Phosphorus	→ Stable	-0.55 µg/L/yr	4

See year-by-year chart →

Reservoir Info (USACE NID)

Lewisville Lake is a man-made reservoir impounded by the Lewisville Dam (completed 1955), built primarily for flood risk reduction on the Elm Fork of The Trinity River; earth-type dam, 135 ft tall and 32,328 ft long.

Surface area: 23,280 ac
Normal storage: 618,400 ac-ft
Max storage: 1,804,300 ac-ft
Drainage area: 1,660 sq mi
Hazard class: High
Owner: USACE - Fort Worth District

All listed purposes: Flood Risk Reduction;Fish and Wildlife Pond;Recreation;Hydroelectric;Water Supply.

Source: USACE National Inventory of Dams, NID ID TX00008 · Operator website

County Ranking

Ranked #1 of 6 lakes in Denton County

Nearby Lakes in Denton County

DRay Roberts Lake Site3.9 ft clear · Eutrophic20.3 miView →DGrapevine Lake2.4 ft clear · Eutrophic10.8 miView →NRNorth Lake—View →NRLake Carolyn—View →NRBachman Lake—View →DRay Roberts Lake2.6 ft clear · Eutrophic21.9 miView →

Frequently asked questions about Lewisville Lake

Where is Lewisville Lake?: Lewisville Lake is a lake in Denton County, Texas. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lewisville Lake?: Lewisville Lake in Denton County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 1.8 ft visibility. Phosphorus: 43 µg/L. Chlorophyll-a (algae): 26.8 µg/L. Surface area: 23280 acres.
Is Lewisville Lake safe to swim in?: The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lewisville Lake?: Lewisville Lake has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Tower Bay Park, Lewisville City Park, Lewisville City Park, Oakland Park, among others. Public access is listed as yes.

Explore Lewisville Lake across LakeQuality

Wakesurfing on Lewisville Lake

Depth, room, public access, and the state wake-sport rules

Hydrous Wake Park

4.6 mi away · cable-pulled, no boat wake

Lake Fishing Forecast

Species activity outlook by water temperature and season

Texas Lake Trips

Where to stay at Texas's top lakes, each with its grade

Eutrophic Lakes

High nutrients, frequent algae, reduced clarity

The State of Texas's Lakes

Texas's cleanest and most-polluted lakes, ranked

More Texas Lake Rankings

Cleanest lakes in Texas

Ranked by overall water quality grade

Clearest lakes in Texas

Top 25 by Secchi water clarity

Best swimming lakes in Texas

Grade A/B + low algae filter

Family fishing lakes in Texas

Panfish-rich, public access

All Texas lakes

Full state directory

Other Grade D Lakes in Texas

Grapevine Lake

Tarrant County · 2.4 ft

Ray Roberts Lake

Cooke County · 2.6 ft

Marine Creek Lake

Tarrant County · 3.3 ft

Lake Tawakoni

Hunt County · 1.5 ft

Lake Whitney

Bosque County · 3.1 ft

Whitney Lake

Hill County · 4.8 ft

Eutrophic Lakes in Texas

Grapevine Lake Ray Roberts Lake Lake Kiowa Marine Creek Lake

Where this data comes from

1,060 measurements from 19 monitoring stations, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

USGS Texas Water Science CenterUSGS-TX1,021 samples · 2020–2024
Texas Commission on Environmental QualityTCEQMAIN39 samples · 2021–2026

Monitoring station identifiers (19)

Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.

Other records on this page

Named boat-access points from the USGS National Boat Ramps inventory