Jacomo Lake
Jackson County, Missouri1,221 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- #1 of 23 in the county
- 67 ft max depth
- Public access
Jacomo Lake in Jackson County, Missouri has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 20.5 µg/L. Chlorophyll-a (algae): 13.6 µg/L. Surface area: 1221 acres.
- Clarity
- 3.3 ft
- Typical in September
- 76°F
- Max depth
- ~67 ft est.
- Area
- 1,221 acres
- Type
- Eutrophic
- Phosphorus
- 20.5 µg/L
- Chlorophyll-a
- 13.6 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Jacomo Lake’s letter
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Jacomo Lake is a 1,221-acre productive, nutrient-rich eutrophic lake in Jackson County, Missouri with an estimated average depth of about 67 feet. Water quality is graded B based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 22 other monitored lakes in Jackson County, Jacomo Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-17. Grade methodology: LakeQuality methodology.
What Jacomo Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water1,221 acres
Swimming Safety
Grade onlyLow algae
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Very murky, less than 3.3 ft of visibility. Phosphorus 20.5 µg/L. Chlorophyll-a 13.6 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | Not graded |
| Phosphorus | 20.5 µg/L | Good |
| Chlorophyll-a (Algae) | 13.6 µg/L | Good |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Jacomo Lake typically sits around 76°F at the surface in September. Summer average is about 82°F. Usually warmest in Jul (about 84°F) and coldest in Apr (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 87 field readings (2012–2024) via the EPA Water Quality Portal. See the full Jacomo Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~67 ft est. |
| Average Depth | ~45 ft est. |
| Surface Area | 1,221 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Jacomo Lake.
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
- Lake JacomoPublic
- Lake JacomoPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Jacomo Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.019 m/yr | 5 |
| Phosphorus | ↓ Declining | +2.29 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.61 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Jacomo Lake is a man-made reservoir impounded by the Lake Jacomo Dam (completed 1956), built primarily for recreation on the EAST FORK LITTLE BLUE RIVER.; earth-type dam, 74 ft tall and 1,550 ft long.
- Surface area
- 1,221 ac
- Normal storage
- 25,730 ac-ft
- Max storage
- 38,620 ac-ft
- Drainage area
- 26.17 sq mi
- Hazard class
- High
- Owner
- JACKSON COUNTY
Source: USACE National Inventory of Dams, NID ID MO10045 · Operator website
County Ranking
Ranked #1 of 23 lakes in Jackson County
Nearby Lakes in Jackson County
Frequently asked questions about Jacomo Lake
Where is Jacomo Lake?
- Jacomo Lake is a lake in Jackson County, Missouri. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Jacomo Lake?
- Jacomo Lake in Jackson County, Missouri has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 20.5 µg/L. Chlorophyll-a (algae): 13.6 µg/L. Surface area: 1221 acres.
Is Jacomo Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Jacomo Lake?
- Jacomo Lake typically sits around 76°F at the surface in September, from 87 EPA Water Quality Portal field readings (2012–2024). That is a typical value for the month, not a live reading.
How deep is Jacomo Lake?
- No published bathymetric survey covers Jacomo Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 67 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 1221 acres.
Are there boat ramps on Jacomo Lake?
- Jacomo Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lake Jacomo, Lake Jacomo. Public access is listed as yes.
Explore Jacomo Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
116 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
UMC116 samples · 2020–2024
Analytical methods
- Depth, Secchi disk in meters
- 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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory