Ravenna Lake E of Ravenna
Buffalo County, Nebraska17 acresView mapDirections
Nutrients and algae run well above the regional average.
↓ down from D at the last regrade
- Hypereutrophic
- Impaired · Mercury
- #2 of 2 in the county
- Public access
- Limited data
Ravenna Lake E of Ravenna in Buffalo County, Nebraska has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 35.1 µg/L. Surface area: 17 acres.
- Area
- 17 acres
- Type
- Hypereutrophic
- Chlorophyll-a
- 35.1 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Ravenna Lake E of Ravenna
Compare lakeside cabins, hotels, and vacation rentals near Ravenna Lake E of Ravenna in Buffalo County, Nebraska — 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 Ravenna Lake E of Ravenna are listed below.
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Ravenna Lake E of Ravenna is a 17-acre highly nutrient-loaded hypereutrophic lake in Buffalo County, Nebraska. Water quality is graded F based on 1 sampling years through 2019. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 1 other monitored lakes in Buffalo County, Ravenna Lake E of Ravenna ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, NDEE, last sampled 2019-09-24. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 F is nutrients and algae, not a swimming clearance. Ravenna Lake E of Ravenna is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Chlorophyll-a 35.1 µg/L. TSI 66. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 35.1 µg/L | Poor |
| Trophic State Index (TSI) | 66 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 17 acres |
| Public Access | Yes |
No bathymetric survey has been published for Ravenna Lake E of Ravenna, so its depth is not documented here.
Fishing Ravenna Lake E of Ravenna
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Chlorophyll-a | ↑ Improving | -17.9 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Ravenna Lake E of Ravenna is a man-made reservoir impounded by the Ravenna State Lake Dam (completed 1939), built primarily for recreation on the Tr-South Loup River; earth-type dam, 10 ft tall and 328 ft long.
- Surface area
- 17 ac
- Normal storage
- 48 ac-ft
- Max storage
- 120 ac-ft
- Drainage area
- 2 sq mi
- Hazard class
- Low
- Owner
- Buffalo County
Source: USACE National Inventory of Dams, NID ID NE00284 · Operator website · Matched by proximity (0.09 km)
EPA Impairment Status
Ravenna Lake E of Ravenna is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NE-LO4-L0010 · Official waterbody report · Matched by proximity (0.29 km)
County Ranking
Ranked #2 of 2 lakes in Buffalo County
Nearby Lakes With Higher Grades
Ravenna Lake E of Ravenna holds Grade F. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Buffalo County
Frequently asked questions about Ravenna Lake E of Ravenna
Where is Ravenna Lake E of Ravenna?
- Ravenna Lake E of Ravenna is a lake in Buffalo County, Nebraska. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ravenna Lake E of Ravenna?
- Ravenna Lake E of Ravenna in Buffalo County, Nebraska has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 35.1 µg/L. Surface area: 17 acres.
Is Ravenna Lake E of Ravenna safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Ravenna Lake E of Ravenna is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Explore Ravenna Lake E of Ravenna across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Nebraska's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Where this data comes from
14 measurements from 1 monitoring station, 2018–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Nebraska Department of Environment and Energy
21NEB001_WQX14 samples · 2018–2019
Analytical methods
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
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
Impairment status from EPA ATTAINS 303(d) database