Tri City Lake
Boone County, Missouri28 acresView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- #6 of 10 in the county
- Public access
Tri City Lake in Boone County, Missouri has a water quality grade of D (Nutrient-rich). Phosphorus: 76 µg/L. Chlorophyll-a (algae): 24.7 µg/L. Surface area: 28 acres.
- Typical in September
- 76°F
- Area
- 28 acres
- Type
- Eutrophic
- Phosphorus
- 76 µg/L
- Chlorophyll-a
- 24.7 µg/L
- Trend
- → Stable
- Public access
- Yes
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Stays near Tri City Lake
Compare lakeside cabins, hotels, and vacation rentals near Tri City Lake in Boone 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Tri City Lake are listed below.
Top-rated places to stay near Tri City Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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Tri City Lake is a 28-acre productive, nutrient-rich eutrophic lake in Boone County, Missouri. Water quality is graded D based on 2 sampling years through 2024. Phosphorus level is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 9 other monitored lakes in Boone County, Tri City Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-05-22. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae 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.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 76 µg/L. Chlorophyll-a 24.7 µg/L. TSI 64. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 76 µg/L | Poor |
| Chlorophyll-a (Algae) | 24.7 µg/L | Poor |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Tri City Lake typically sits around 76°F at the surface in September. Summer average is about 83°F. Usually warmest in Jul (about 85°F) and coldest in May (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 54 field readings (2010–2024) via the EPA Water Quality Portal. See the full Tri City Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 28 acres |
| Public Access | Yes |
No bathymetric survey has been published for Tri City Lake, so its depth is not documented here.
Fishing Tri City Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -28.4 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.76 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Tri City Lake is a man-made reservoir impounded by the Tri-City Community Lake Dam (completed 1957), built primarily for recreation on the TR-SILVER FORK CREEK; earth-type dam, 25 ft tall.
- Surface area
- 28 ac
- Normal storage
- 233 ac-ft
- Max storage
- 374 ac-ft
- Drainage area
- 400 sq mi
- Hazard class
- Low
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO10102 · Operator website · Matched by proximity (0.08 km)
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of Tri City Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 5 facilities have a reported Clean Water Act violation in the past three years.
- Centralia WwtfCentralia · 3.6 mi away · NPDES MO0028789MajorRecent violation
- Little City MhpCentralia · 3 mi away · NPDES MO0057363Recent violation
- Sunnydale Adventist Academy WwtfCentralia · 3.9 mi away · NPDES MO0044563Recent violation
- Sturgeon WwtfSturgeon · 4.7 mi away · NPDES MO0052027Recent violation
- Bcrsd Sunnyslope Subd WwtfHallsville · 4.9 mi away · NPDES MO0095354Recent violation
- Jbs Live Pork Centralia Feed MillCentralia · 3.2 mi away · NPDES MONX00514
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #6 of 10 lakes in Boone County
Nearby Lakes With Higher Grades
Tri City Lake holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Boone County
Frequently asked questions about Tri City Lake
Where is Tri City Lake?
- Tri City Lake is a lake in Boone County, Missouri. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Tri City Lake?
- Tri City Lake in Boone County, Missouri has a water quality grade of D (Nutrient-rich). Phosphorus: 76 µg/L. Chlorophyll-a (algae): 24.7 µg/L. Surface area: 28 acres.
Is Tri City Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Tri City Lake?
- Tri City Lake typically sits around 76°F at the surface in September, from 54 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Tri City Lake across LakeQuality
More Missouri Lake Rankings
Other Grade D Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
21 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC21 samples · 2020–2024
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)