Lamar City Lk. South Arm Lake is a 150-acre 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. South Arm Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2020-11-04. Grade methodology: LakeGrade methodology.
Watch Lamar City Lk. South Arm Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2.1 ft of visibility. Phosphorus level: 80.4 µg/L. Chlorophyll-a: 39 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | F |
| Phosphorus | 80.4 µg/L | D |
| Chlorophyll-a (Algae) | 39 µg/L | F |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 150 acres |
Where to stay near Lamar City Lk. South Arm Lake
Compare lakeside cabins, hotels, and vacation rentals near Lamar City Lk. South 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. South Arm 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 trip to Lamar City Lk. South Arm Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Lamar City Lk. South Arm Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Missouri’s top lakes →
Fishing Lamar City Lk. South Arm Lake
Location
County Ranking
Ranked #1 of 6 lakes in Barton County
Cleaner Lakes Within 30 Miles
Lamar City Lk. South Arm Lake holds Grade F. 2 nearby lakes hold higher grades.
- BStockton State Park Marina LakeCedar County · 29.8 mi · Two grade letters higher (F → B)
- BStockton LakeCedar County · 30 mi · Two grade letters higher (F → B)
Nearby Lakes in Barton County
Explore Lamar City Lk. South 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
Stone County · Clarity: 2.6 ft
Hickory County · Clarity: 1.2 ft
Hickory County · Clarity: 1 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Lamar City Lk. South Arm Lake is a man-made reservoir impounded by the Lamar Lake Dam (completed 1955), built primarily for recreation on the TR TO NORTH FORK SPRING RIVER; earth-type dam, 26 ft tall.
- Surface area
- 150 ac
- Normal storage
- 1,050 ac-ft
- Max storage
- 2,086 ac-ft
- Drainage area
- 3,100 sq mi
- Hazard class
- High
- Owner
- CITY OF LAMAR
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO20002 · Operator website · Matched by proximity (0.76 km)
EPA Impairment Status
Lamar City Lk. South 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 (0.46 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