Lake Millwood
Little River County, Arkansas29,000 acresView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Eutrophic
- #1 of 1 in the county
- 78 ft max depth
- Public access
- Limited data
Lake Millwood in Little River County, Arkansas has a water quality grade of D (Nutrient-rich). Water clarity: 1 ft visibility. Phosphorus: 90 µg/L. Chlorophyll-a (algae): 29.6 µg/L. Surface area: 29000 acres.
- Clarity
- 1 ft
- Max depth
- ~78 ft est.
- Area
- 29,000 acres
- Type
- Eutrophic
- Phosphorus
- 90 µg/L
- Chlorophyll-a
- 29.6 µg/L
- Public access
- Yes
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Stays near Lake Millwood
Compare lakeside cabins, hotels, and vacation rentals near Lake Millwood in Little River County, Arkansas — 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 Lake Millwood are listed below.
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Watch Lake Millwood’s letter
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Lake Millwood is a 29,000-acre productive, nutrient-rich eutrophic lake in Little River County, Arkansas with an estimated average depth of about 78 feet. Water quality is graded D based on 2 sampling years through 2019. Limited fish-species data available. Public access is available with 15 public boat landings.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2019-08-19. Grade methodology: LakeQuality methodology.
What Lake Millwood is good for
From access and monitoring records, not editorial picks.
- Boat launch15 documented ramps
- Big water29,000 acres
Swimming Safety
Grade onlyLimited data
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.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1 ft of visibility. Phosphorus 90 µg/L. Chlorophyll-a 29.6 µg/L. TSI 70. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | 90 µg/L | Poor |
| Chlorophyll-a (Algae) | 29.6 µg/L | Poor |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~78 ft est. |
| Surface Area | 29,000 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arkansas has not published bathymetry for Lake Millwood.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- PeytonPublic
- White CliffsPublic
- Millwood State ParkPublic
- Millwood Dam Tailwaters (East)Public
- Millwood Dam Tailwaters (West)Public
- YarboroughPublic
Showing 6 of 15 documented landings from the USGS National Boat Ramps inventory.
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Millwood
Reservoir Info (USACE NID)
Lake Millwood is a man-made reservoir impounded by the Millwood Dam (completed 1966), built primarily for flood risk reduction on the Little; concrete-type dam, 88 ft tall and 14,500 ft long.
- Surface area
- 29,000 ac
- Normal storage
- 172,000 ac-ft
- Max storage
- 1,854,930 ac-ft
- Drainage area
- 4,144 sq mi
- Hazard class
- High
- Owner
- USACE - Little Rock District
All listed purposes: Flood Risk Reduction;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID AR00536 · Operator website
County Ranking
Ranked #1 of 1 lakes in Little River County
Nearby Lakes in Little River County
Frequently asked questions about Lake Millwood
Where is Lake Millwood?
- Lake Millwood is a lake in Little River County, Arkansas. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Millwood?
- Lake Millwood in Little River County, Arkansas has a water quality grade of D (Nutrient-rich). Water clarity: 1 ft visibility. Phosphorus: 90 µg/L. Chlorophyll-a (algae): 29.6 µg/L. Surface area: 29000 acres.
Is Lake Millwood safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Millwood?
- No published bathymetric survey covers Lake Millwood, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 78 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 29000 acres.
Are there boat ramps on Lake Millwood?
- Lake Millwood has 15 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Peyton, White Cliffs, Millwood State Park, Millwood Dam Tailwaters (East), among others. Public access is listed as yes.
Explore Lake Millwood across LakeQuality
More Arkansas Lake Rankings
Other Grade D Lakes in Arkansas
Eutrophic Lakes in Arkansas
Where this data comes from
189 measurements from 2 monitoring stations, 2012–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX189 samples · 2012–2019
Analytical methods
- 4500 P J ~ Persulfate Method for Simultaneous Determination of Total Nitrogen and Total Phosphorus
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory