Lake Hennessey

Ecosystem Overview

The Lake Hennessey ecosystem supports 34 documented wildlife species across 33 taxonomic genera. Located in Napa County, California, this area provides critical habitat with diverse natural communities. The location hosts 7 frequently observed species and 6 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. While Napa nearby has 66% more documented species, Lake Hennessey offers unique wildlife observation opportunities. This location ranks #3 for species diversity among 7 Napa County County natural areas, placing it in the 57th percentile for biodiversity.

Biodiversity Highlights

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 7 locations

Species Distribution

Very Common7 species

Common11 species

Occasional10 species

Rare6 species

Regional Context

Regional Ranking

#3 of 7 locations

57th percentile for diversity

vs. Napa

-66% species diversity

Ecosystem Overview

‌
‌
‌
‌

Biodiversity Highlights

‌

Species Distribution

Very Common‌

Common‌

Occasional‌

Rare‌

Regional Context

Regional Ranking

‌

Most Common Species

Showing 20 most frequently observed species out of 34 total documented species.

Toxomerus marginatus

Syrphid Fly

Very Common3 obs.

Arbutus menziesii

Pacific madrone

Very Common3 obs.

Vespula pensylvanica

Very Common2 obs.

Fulica americana

American Coot

Very Common2 obs.

Aechmophorus occidentalis

Western Grebe

Very Common2 obs.

Podilymbus podiceps

Pied-billed grebe

Common2 obs.

Mentha pulegium

penny-royal

Common2 obs.

Diabrotica undecimpunctata

Spotted Cucumber Beetle

Common1 obs.

Apis mellifera

Western Honey Bee

Common1 obs.

Ischnura cervula

Pacific Forktail

Common1 obs.

Erythemis collocata

Western Pondhawk

Common1 obs.

Marmara arbutiella

Occasional1 obs.

Alopecosa kochi

Occasional1 obs.

Armadillidium vulgare

common pill woodlouse

Occasional1 obs.

Procambarus clarkii

red swamp crawfish

Occasional1 obs.

Microtus californicus

California Vole

Occasional1 obs.

Pandion haliaetus

osprey

Occasional1 obs.

Gallinago delicata

Wilson's Snipe

Rare1 obs.

Cathartes aura

Turkey Vulture

Rare1 obs.

Melospiza melodia

Song Sparrow

Rare1 obs.

Want the Complete Field Guide?

Get all 34 species with 3-4 high-quality images each, detailed descriptions, and a downloadable PDF for offline use.

Premium field guide includes identification tips, seasonal patterns, and professional layout optimized for field use.

Most Common Species

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

Want the Complete Field Guide?

‌
‌

‌

Get Your Personalized Field Guide

Download a professional PDF field guide featuring all the species found in Lake Hennessey. Perfect for outdoor adventures, education, and nature exploration.

$6.99

Get Your Personalized Field Guide

Download a professional PDF field guide featuring all the species found in Lake Hennessey. Perfect for outdoor adventures, education, and nature exploration.

Email Address (for delivery)

Your field guide will be delivered to this email address. Please double-check for accuracy.

$6.99

Regional Comparison

Regional Ranking

Species Count

-19%

vs. Regional Average

Compared to 6 nearby locations in Napa County County, California

Nearby Natural Areas

Napa

Importance: 0.48

100 species

-66% vs. current

Napa County

Importance: 0.47

100 species

-66% vs. current

Lake Berryessa

Importance: 0.40

22 species

+55% vs. current

Angwin

Importance: 0.34

28 species

+21% vs. current

Indian Island

Importance: 0.33

1 species

+3300% vs. current

Deer Park

Importance: 0.30

1 species

+3300% vs. current

About This Comparison

These comparisons are based on documented wildlife observations from citizen science data. Locations with higher species counts may have more observation activity, different habitat types, or larger coverage areas. Regional rankings help identify biodiversity hotspots and unique natural areas within Napa County County.

Regional Comparison

‌

Regional Ranking

‌

Species Count

‌

vs. Regional Average

‌

Nearby Natural Areas

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

About This Comparison

‌
‌
‌

Regional Comparison

Regional Ranking

Species Count

-19%

vs. Regional Average

Compared to 6 nearby locations in Napa County County, California

Nearby Natural Areas

Napa

Importance: 0.48

100 species

-66% vs. current

Napa County

Importance: 0.47

100 species

-66% vs. current

Lake Berryessa

Importance: 0.40

22 species

+55% vs. current

Angwin

Importance: 0.34

28 species

+21% vs. current

Indian Island

Importance: 0.33

1 species

+3300% vs. current

Deer Park

Importance: 0.30

1 species

+3300% vs. current

About This Comparison

Ecosystem Overview

Biodiversity Highlights

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 7 locations

Species Distribution

Very Common7 species

Common11 species

Occasional10 species

Rare6 species

Regional Context

Regional Ranking

#3 of 7 locations

57th percentile for diversity

vs. Napa

-66% species diversity

Most Common Species

Showing 20 most frequently observed species out of 34 total documented species.

Toxomerus marginatus

Syrphid Fly

Very Common3 obs.

Arbutus menziesii

Pacific madrone

Very Common3 obs.

Vespula pensylvanica

Very Common2 obs.

Fulica americana

American Coot

Very Common2 obs.

Aechmophorus occidentalis

Western Grebe

Very Common2 obs.

Podilymbus podiceps

Pied-billed grebe

Common2 obs.

Mentha pulegium

penny-royal

Common2 obs.

Diabrotica undecimpunctata

Spotted Cucumber Beetle

Common1 obs.

Apis mellifera

Western Honey Bee

Common1 obs.

Ischnura cervula

Pacific Forktail

Common1 obs.

Erythemis collocata

Western Pondhawk

Common1 obs.

Marmara arbutiella

Occasional1 obs.

Alopecosa kochi

Occasional1 obs.

Armadillidium vulgare

common pill woodlouse

Occasional1 obs.

Procambarus clarkii

red swamp crawfish

Occasional1 obs.

Microtus californicus

California Vole

Occasional1 obs.

Pandion haliaetus

osprey

Occasional1 obs.

Gallinago delicata

Wilson's Snipe

Rare1 obs.

Cathartes aura

Turkey Vulture

Rare1 obs.

Melospiza melodia

Song Sparrow

Rare1 obs.

Want the Complete Field Guide?

Get all 34 species with 3-4 high-quality images each, detailed descriptions, and a downloadable PDF for offline use.

Premium field guide includes identification tips, seasonal patterns, and professional layout optimized for field use.