Mark Twain Lake
Mark Twain Lake in Monroe County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 3086 acres.
- Area
- 3,086 acres
- Public access
- Yes
Next lake in Monroe County
Swipe left or right on this bar to open the next or previous lake.
Why Mark Twain Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Mark Twain Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mark Twain Lake is a 3,086-acre lake in Monroe County, Missouri. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Mark Twain Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Mark Twain Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Mark Twain Lake
Compare lakeside cabins, hotels, and vacation rentals near Mark Twain Lake in Monroe County, Missouri — 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.
Top-rated places to stay near Mark Twain Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Missouri’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 3,086 acres |
| Public Access | Yes |
No bathymetric survey has been published for Mark Twain Lake, so its depth is not documented here.
Recreation & Access
- Route 466Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Mark Twain Lake
Nearby Lakes in Monroe County
Frequently asked questions about Mark Twain Lake
Where is Mark Twain Lake?
- Mark Twain Lake is a lake in Monroe County, Missouri. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Mark Twain Lake?
- Mark Twain Lake in Monroe County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 3086 acres.
Is Mark Twain Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mark Twain Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Mark Twain Lake?
- Mark Twain Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Route 466. Public access is listed as yes.
Explore Mark Twain Lake across LakeQuality
More Missouri Lake Rankings
Other Lakes in Missouri
Where this data comes from
Measurements for Mark Twain Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory