Contra Loma Reservoir

Ecosystem Overview

The Contra Loma Reservoir ecosystem supports 64 documented wildlife species across 53 taxonomic genera. Located in Contra Costa County, California, this area provides critical habitat with diverse natural communities. The location hosts 13 frequently observed species and 12 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. While Contra Costa County nearby has 36% more documented species, Contra Loma Reservoir offers unique wildlife observation opportunities. This location ranks #15 for species diversity among 45 Contra Costa County County natural areas, placing it in the 67th 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

#15

Regional Rank

Out of 45 locations

Species Distribution

Very Common13 species

Common20 species

Occasional19 species

Rare12 species

Regional Context

Regional Ranking

#15 of 45 locations

67th percentile for diversity

vs. Contra Costa County

-36% 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 64 total documented species.

Podilymbus podiceps

Pied-billed grebe

Very Common17 obs.

Pelecanus erythrorhynchos

American White Pelican

Very Common15 obs.

Anas platyrhynchos

mallard

Very Common8 obs.

Fulica americana

American Coot

Very Common8 obs.

Zonotrichia leucophrys

white-crowned sparrow

Very Common7 obs.

Butorides virescens

green heron

Common7 obs.

Bucephala clangula

common goldeneye

Common6 obs.

Larus delawarensis

Ring-billed Gull

Common6 obs.

Branta canadensis

Canada goose

Common6 obs.

Sayornis nigricans

black phoebe

Common5 obs.

Melospiza lincolnii

Lincoln Sparrow

Common5 obs.

Sylvilagus audubonii

Desert Cottontail

Occasional4 obs.

Tachycineta bicolor

Tree/Violet-Green Swallow

Occasional4 obs.

Porzana carolina

Sora

Occasional3 obs.

Lepomis microlophus

Redear

Occasional3 obs.

Ardea herodias

Great Blue Heron

Occasional3 obs.

Euphagus cyanocephalus

Brewer's blackbird

Occasional3 obs.

Calypte anna

Anna's Hummingbird

Rare3 obs.

Charadrius vociferus

Killdeer

Rare2 obs.

Colaptes auratus

common flicker

Rare2 obs.

Want the Complete Field Guide?

Get all 64 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 Contra Loma Reservoir. 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 Contra Loma Reservoir. 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

-22%

vs. Regional Average

Compared to 8 nearby locations in Contra Costa County County, California

Nearby Natural Areas

Contra Costa County

Importance: 0.49

100 species

-36% vs. current

Richmond

Importance: 0.49

100 species

-36% vs. current

Concord

Importance: 0.46

100 species

-36% vs. current

Walnut Creek

Importance: 0.45

100 species

-36% vs. current

Antioch

Importance: 0.44

100 species

-36% vs. current

Moraga

Importance: 0.43

47 species

+36% vs. current

Orinda

Importance: 0.43

100 species

-36% vs. current

Pittsburg

Importance: 0.43

11 species

+482% 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 Contra Costa County County.

Regional Comparison

‌

Regional Ranking

‌

Species Count

‌

vs. Regional Average

‌

Nearby Natural Areas

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

‌
‌

‌

About This Comparison

‌
‌
‌

Regional Comparison

Regional Ranking

Species Count

-22%

vs. Regional Average

Compared to 8 nearby locations in Contra Costa County County, California

Nearby Natural Areas

Contra Costa County

Importance: 0.49

100 species

-36% vs. current

Richmond

Importance: 0.49

100 species

-36% vs. current

Concord

Importance: 0.46

100 species

-36% vs. current

Walnut Creek

Importance: 0.45

100 species

-36% vs. current

Antioch

Importance: 0.44

100 species

-36% vs. current

Moraga

Importance: 0.43

47 species

+36% vs. current

Orinda

Importance: 0.43

100 species

-36% vs. current

Pittsburg

Importance: 0.43

11 species

+482% 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

#15

Regional Rank

Out of 45 locations

Species Distribution

Very Common13 species

Common20 species

Occasional19 species

Rare12 species

Regional Context

Regional Ranking

#15 of 45 locations

67th percentile for diversity

vs. Contra Costa County

-36% species diversity

Most Common Species

Showing 20 most frequently observed species out of 64 total documented species.

Podilymbus podiceps

Pied-billed grebe

Very Common17 obs.

Pelecanus erythrorhynchos

American White Pelican

Very Common15 obs.

Anas platyrhynchos

mallard

Very Common8 obs.

Fulica americana

American Coot

Very Common8 obs.

Zonotrichia leucophrys

white-crowned sparrow

Very Common7 obs.

Butorides virescens

green heron

Common7 obs.

Bucephala clangula

common goldeneye

Common6 obs.

Larus delawarensis

Ring-billed Gull

Common6 obs.

Branta canadensis

Canada goose

Common6 obs.

Sayornis nigricans

black phoebe

Common5 obs.

Melospiza lincolnii

Lincoln Sparrow

Common5 obs.

Sylvilagus audubonii

Desert Cottontail

Occasional4 obs.

Tachycineta bicolor

Tree/Violet-Green Swallow

Occasional4 obs.

Porzana carolina

Sora

Occasional3 obs.

Lepomis microlophus

Redear

Occasional3 obs.

Ardea herodias

Great Blue Heron

Occasional3 obs.

Euphagus cyanocephalus

Brewer's blackbird

Occasional3 obs.

Calypte anna

Anna's Hummingbird

Rare3 obs.

Charadrius vociferus

Killdeer

Rare2 obs.

Colaptes auratus

common flicker

Rare2 obs.

Want the Complete Field Guide?

Get all 64 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.