Lamar City Lk. East Arm Lake is a productive, nutrient-rich eutrophic lake in Barton County, Missouri. Water quality is graded F based on 3 sampling years through 2020. Compared to the 5 other monitored lakes in Barton County, Lamar City Lk. East Arm Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2020-11-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.9 ft of visibility. Phosphorus level: 72.3 µg/L. Chlorophyll-a: 32.1 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft | F |
| Phosphorus | 72.3 µg/L | D |
| Chlorophyll-a (Algae) | 32.1 µg/L | F |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lamar City Lk. East Arm Lake
Compare lakeside cabins, hotels, and vacation rentals near Lamar City Lk. East Arm Lake in Barton 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 Lamar City Lk. East Arm Lake
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Fishing Lamar City Lk. East Arm Lake
Water Temperature
Lamar City Lk. East Arm Lake averages about 82°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in Aug (about 80°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 12 field readings (2020–2020) via the EPA Water Quality Portal. See the full Lamar City Lk. East Arm Lake water temperature breakdown →
Location
County Ranking
Ranked #2 of 6 lakes in Barton County
Cleaner Lakes Within 30 Miles
Lamar City Lk. East Arm Lake holds Grade F. 2 nearby lakes hold higher grades.
- BStockton State Park Marina LakeCedar County · 29.6 mi · Two grade letters higher (F → B)
- BStockton LakeCedar County · 29.8 mi · Two grade letters higher (F → B)
Nearby Lakes in Barton County
Explore Lamar City Lk. East Arm Lake across LakeGrade
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
Vernon County · Clarity: 1.5 ft
Henry County · Clarity: 0.6 ft
Bates County · Clarity: 0.9 ft
Hickory County · Clarity: 1.2 ft
Stone County · Clarity: 2.6 ft
Hickory County · Clarity: 1 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
EPA Impairment Status
Lamar City Lk. East Arm Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MO_7356.00 · Official waterbody report · Matched by proximity (0.07 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-11-04
Monitoring stations: 1