Multnomah County

Ecosystem Overview

The Multnomah County ecosystem supports 100 documented wildlife species across 93 taxonomic genera. Located in Multnomah County, Oregon, this area provides critical habitat with diverse natural communities. The location hosts 21 frequently observed species and 19 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. Compared to nearby Gresham, Multnomah County hosts 61% more species diversity. This location ranks #1 for species diversity among 21 Multnomah County County natural areas, placing it in the 95th percentile for biodiversity.

Biodiversity Highlights

100

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 21 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#1 of 21 locations

95th percentile for diversity

vs. Gresham

+61% species diversity

Ecosystem Overview

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Biodiversity Highlights

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Species Distribution

Very Common‌

Common‌

Occasional‌

Rare‌

Regional Context

Regional Ranking

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Most Common Species

Showing 20 most frequently observed species out of 100 total documented species.

Corvus brachyrhynchos

American Crow

Very Common166 obs.

Melospiza melodia

Song Sparrow

Very Common103 obs.

Junco hyemalis

dark-eyed junco

Very Common102 obs.

Polystichum munitum

western sword fern

Very Common75 obs.

Thuja plicata

giant arborvitae

Very Common73 obs.

Ariolimax columbianus

Pacific banana slug

Common71 obs.

Turdus migratorius

American Robin

Common69 obs.

Sciurus carolinensis

Grey squirrel

Common62 obs.

Rubus parviflorus

Common62 obs.

Branta canadensis

Canada goose

Common61 obs.

Araneus diadematus

european garden spider

Common58 obs.

Geranium robertianum

herb-robert

Occasional56 obs.

Acer macrophyllum

Big-Leaf Maple

Occasional55 obs.

Ailanthus altissima

Tree of heaven

Occasional54 obs.

Acer circinatum

Vine Maple

Occasional54 obs.

Pipilo maculatus

Spotted Towhee (Maculatus Group)

Occasional53 obs.

Calypte anna

Anna's Hummingbird

Occasional51 obs.

Trillium ovatum

Western White Wakerobin

Rare51 obs.

Polypodium glycyrrhiza

licorice fern

Rare50 obs.

Tellima grandiflora

fringecups

Rare49 obs.

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Most Common Species

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Get Your Personalized Field Guide

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

$6.99

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Regional Comparison

Regional Ranking

100

Species Count

+426%

vs. Regional Average

Compared to 8 nearby locations in Multnomah County County, Oregon

Nearby Natural Areas

Gresham

Importance: 0.43

62 species

+61% vs. current

Oaks Bottom Lake

Importance: 0.35

20 species

+400% vs. current

Crystal Springs Lake

Importance: 0.35

18 species

+456% vs. current

Sandy River

Importance: 0.35

16 species

+525% vs. current

Smith Lake

Importance: 0.35

15 species

+567% vs. current

Bybee Lake

Importance: 0.35

15 species

+567% vs. current

Force Lake

Importance: 0.35

5 species

+1900% vs. current

Mill Pond

Importance: 0.35

3 species

+3233% 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 Multnomah County County.

Regional Comparison

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Regional Ranking

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Species Count

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vs. Regional Average

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Nearby Natural Areas

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About This Comparison

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Regional Comparison

Regional Ranking

100

Species Count

+426%

vs. Regional Average

Compared to 8 nearby locations in Multnomah County County, Oregon

Nearby Natural Areas

Gresham

Importance: 0.43

62 species

+61% vs. current

Oaks Bottom Lake

Importance: 0.35

20 species

+400% vs. current

Crystal Springs Lake

Importance: 0.35

18 species

+456% vs. current

Sandy River

Importance: 0.35

16 species

+525% vs. current

Smith Lake

Importance: 0.35

15 species

+567% vs. current

Bybee Lake

Importance: 0.35

15 species

+567% vs. current

Force Lake

Importance: 0.35

5 species

+1900% vs. current

Mill Pond

Importance: 0.35

3 species

+3233% vs. current

About This Comparison

Ecosystem Overview

Biodiversity Highlights

100

Total Species

Documented wildlife species

Genus Diversity

Taxonomic genera represented

Common Species

Frequently observed species

Rare Species

Occasionally documented species

Regional Rank

Out of 21 locations

Species Distribution

Very Common21 species

Common30 species

Occasional30 species

Rare19 species

Regional Context

Regional Ranking

#1 of 21 locations

95th percentile for diversity

vs. Gresham

+61% species diversity

Most Common Species

Showing 20 most frequently observed species out of 100 total documented species.

Corvus brachyrhynchos

American Crow

Very Common166 obs.

Melospiza melodia

Song Sparrow

Very Common103 obs.

Junco hyemalis

dark-eyed junco

Very Common102 obs.

Polystichum munitum

western sword fern

Very Common75 obs.

Thuja plicata

giant arborvitae

Very Common73 obs.

Ariolimax columbianus

Pacific banana slug

Common71 obs.

Turdus migratorius

American Robin

Common69 obs.

Sciurus carolinensis

Grey squirrel

Common62 obs.

Rubus parviflorus

Common62 obs.

Branta canadensis

Canada goose

Common61 obs.

Araneus diadematus

european garden spider

Common58 obs.

Geranium robertianum

herb-robert

Occasional56 obs.

Acer macrophyllum

Big-Leaf Maple

Occasional55 obs.

Ailanthus altissima

Tree of heaven

Occasional54 obs.

Acer circinatum

Vine Maple

Occasional54 obs.

Pipilo maculatus

Spotted Towhee (Maculatus Group)

Occasional53 obs.

Calypte anna

Anna's Hummingbird

Occasional51 obs.

Trillium ovatum

Western White Wakerobin

Rare51 obs.

Polypodium glycyrrhiza

licorice fern

Rare50 obs.

Tellima grandiflora

fringecups

Rare49 obs.

Want the Complete Field Guide?

Get all 100 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.