WETLANDS, WILDLIFE AND SEASONAL WATER

Water holds the living valley together.

Homestake’s fens and connected wetlands, including wet meadows, willow, beaver ponds and cold streams, offer different kinds of water and shelter. Whitney would flood part of this mosaic and change the routes through it.

Peat takes time that a replacement pond cannot supply.

Fens are groundwater-fed wetlands where partly decayed plants build layers of peat over centuries. Homestake’s fens store water, support cold streams and connect meadow, willow and forest habitat.

Confirmed groundwater-fed fens

CNHP documented a healthy fen baseline near Gold Park in 2011. On September 12, researchers confirmed two groundwater-fed fens with 92 cm and 88 cm of peat, saturated soils and established wetland plant communities. They recorded no disturbance or noxious weeds at either site.

These findings document healthy, functioning fen ecosystems at the surveyed sites in 2011. Protecting Homestake means protecting the groundwater supplies and ecological conditions that sustain these established peatlands. Read the field measurements and condition records.

CNHP’s updated mapping identifies 15 Confirmed Fen polygons in the Homestake watershed. The interactive map displays confirmed fens as their own class, alongside Potential Fen and the broader map’s Confirmed Peat-Accumulating Wetland class. Explore the mapped peatlands · Map sources, classifications and reservoir-overlap versions.

A Colorado fen rewetted 20 years before study still had altered surface peat. Bringing the water back and recovering the soil that stores it are different stages of recovery.

Every modeled Whitney option puts the same 81.4 acres of mapped wetlands and potential fen habitat underwater at full pool. The wider Whitney-to-Eagle assessment identifies 362.1 mapped acres in 36 wetland complexes connected to Homestake Creek, reaching the Eagle River confluence near Red Cliff. Additional water removal would ultimately impact all connected downstream wetland ecosystems.

Reservoir-overlap figures use the September 18, 2026 inventory. Current V2 fen polygons lie outside the stored A–D full pools; mapped wetlands overlap the pools. The historical Potential Fen layer is available separately. Compare current and earlier fen mapping.

Peat recovery study · Inventory classes · Modeled overlap

What an intact wetland system does

Water held here keeps life going.

Homestake's ecological value lies in the work of its connected fens, wet meadows, willow margins, ponds and streams. Together they hold water, preserve carbon-rich soils and give wildlife places to endure seasonal stress.

Cooler summer water for trout

Fens are groundwater-fed wetlands. Where the groundwater systems that sustain them also supply cool water to connected streams, those inflows can moderate summer temperatures and create cold-water refuges for trout and other aquatic life. Research shows trout increasingly seek these cool pockets as surrounding stream temperatures rise.

As climate warming brings more frequent and intense heat waves, protecting these refuges and their water supply becomes increasingly important. Protecting Homestake's fens and groundwater connections helps preserve the conditions that support cold-water habitat in the creek and downstream. Explore the fen, trout and warming-climate evidence.

Water through dry periods

Wet soils, shallow groundwater and ponds also store water within the landscape. Colorado research shows beaver dams keeping surrounding ground wetter through dry summer months; a Canadian Rocky Mountain fen stored and released water as conditions changed. These functions help sustain habitat after peak runoff recedes. Read the water-storage studies.

Carbon accumulated over generations

Keeping peat wet helps preserve the organic carbon built into its soils. Drainage changes both the carbon store and the soil's ability to hold and move water. In four restored Colorado fens, rewetting improved water levels, but damaged surface peat still differed from intact peat after as long as 20 years. Protecting existing fens preserves a living soil system that cannot be quickly replaced. Explore peat carbon and recovery.

Refuges through fire and a changing climate

Across three Rocky Mountain megafires, researchers found lower burn severity in river corridors with beaver dams. Wet patches can retain vegetation and habitat within a burned landscape. Protecting water and the organisms that hold it in place helps preserve those refuges as the West warms. Fairfax and colleagues, 2024.

Water quality, stable soils and food beyond the stream

Wetland vegetation slows water and holds soil; connected floodplains and ponds can retain sediment and transform nutrients. At Colorado's East River, a beaver dam strengthened subsurface exchange and nitrate removal. In Kimball Creek, more beaver-pool habitat was associated with greater aquatic insect biomass emerging per length of stream, carrying food into the surrounding landscape. East River water-quality study · Kimball Creek insect study.

These connections also sustain breeding pools, winter fish refuge, willow-dependent birds and mammals, and wetland plants and pollinators. Flooding habitat or disrupting its water supply can unravel several functions at once. Read the full ecological explanation and sources.

Mapped wetlands and waterways across the complete Homestake, Fall, Peterson and Resolution watersheds.

Explore all four connected watersheds.See the complete Homestake watershed alongside Fall, Peterson and Resolution, with their wetlands and connections to the Eagle River.Open the maps

What another reservoir would mean

More pressure on a watershed already giving up water.

Whitney would flood functioning wetlands and add water collection and export to a system already shaped by Homestake Reservoir. The ecological cost would reach from the flooded valley to the creeks and wetlands left downstream.

Two reservoirs, one connected watershed

The utilities' March 2022 concept would bring water from Fall, Peterson and Resolution Creeks to a new reservoir in the lower valley, then pump it uphill into existing Homestake Reservoir for delivery to the cities. The existing tunnel carries exported water toward Turquoise Lake. How the reservoirs would be connected.

Studies of linked reservoirs show that changes to water temperature and fish communities can build across a river system. For Homestake, the concern is the combined pressure of existing diversions, a newly flooded valley, additional creek collection and the way both reservoirs would operate.

Lose a working wetland. Fens, wet meadows and streamside habitat already store water and carbon and support food webs. Flooding would replace these living systems.

Add new stresses. Flooded plants and soils can release greenhouse gases. Stored water can lose oxygen, and falling or refilling water levels can change water quality.

Leave less water for connected habitat. Additional exports would remove water from a creek system that already supplies the cities, adding pressure on remaining streams, ponds and wetlands. The ecological evidence.

What studies of linked reservoirs found

A study of two reservoirs on China's Jinsha River found that their effects on the seasonal temperature cycle accumulated. Most of the change in flow timing came from the larger upstream reservoir. In Brazil's São Francisco River, fish-community differences were linked to the combined volume of the reservoirs and their positions and spacing along the river.

The outcome depends on the reservoirs and their operations. In three Québec reservoirs, basin shape, the land flooded and climate mattered more for surface-water carbon dioxide and methane concentrations than a reservoir's position in the chain. These findings make the combined effects of existing diversions, new flooding and reservoir operations central to Whitney’s ecological cost. Read the linked-reservoir studies and their relevance.

How flooding can release stored carbon and methane

Flooding can kill vegetation that takes up carbon and stimulate decomposition of plants and peat. In a Canadian experiment, flooding a boreal wetland changed it from a small carbon sink into a substantial carbon source. Methane forms when microbes break down organic matter without oxygen. Reservoir methane can escape in bubbles, across the water surface and from water discharged downstream. These pathways add a climate concern to the loss of an established peat-forming ecosystem. Carbon, methane and the net climate balance.

Why cold water must also contain oxygen

Decomposition consumes dissolved oxygen. When warm surface water and cold deep water form separate layers, oxygen used near the bottom may not be replenished. Fish can lose usable habitat between water that is too warm above and too oxygen-poor below. USGS documented deep-water oxygen depletion at Colorado's Stagecoach Reservoir during its early years. At Idaho's Island Park Reservoir, drawdown during the 2021 drought increased water temperatures, reduced oxygen and squeezed habitat for kokanee, a cold-water salmonid. Oxygen and cold-water habitat studies.

What happens when water stays low or rises again

Falling water levels can trigger pulses of methane bubbles, as documented in Pacific Northwest reservoirs. When low water leaves sediment exposed, that sediment can release carbon dioxide; rates depend on moisture, temperature and organic matter. Reflooding dried sediment can also release phosphorus. In a Virginia reservoir, a drawdown was followed by an algal bloom whose decay further depleted oxygen. Prolonged exposure, falling water and refilling create different stresses across the operating cycle. Drawdown, exposed sediment and nutrient evidence.

Flooding and repeated wetting and drying can also promote conversion of existing mercury into methylmercury, which accumulates in aquatic food webs. At Oregon’s Cottage Grove Reservoir, which receives mercury from a historic mine, researchers found greater methylmercury production in seasonally flooded sediment. Mercury cycling and the study's setting.

How the effects can reach downstream

Reservoir outlets determine which water layer is released, carrying its temperature and chemistry into the receiving creek; aeration during release also affects oxygen. Deep drawdowns can move accumulated sediment and organic matter downstream. Additional exports create a separate pressure by removing water from the connected stream system. Across 37 Colorado stream reaches, researchers found smaller channels and vegetation shifting toward drier-site species below diversions. The cumulative ecological case and sources.

The double ecological hit is losing the wetland's benefits while adding new pressures on the life that remains. Protecting Homestake preserves peat carbon, water through dry periods and the groundwater connections that can provide cool summer refuges for trout.

Seasonal water sustains the connected ecosystem.

Spring runoff connects channels and wet ground. Falling summer water makes persistent pools and cold-water refuges more important. Severe drying can remove those options.

Wet and dry years change the usable network.

Wet years and high runoff: Water can connect lower-energy side channels and backwaters, opening more places to forage and build dams away from the strongest current.
Falling water and low flow: As lateral waters disconnect, persistent ponds and main-channel water can become more important. Lower main-channel flows can also allow seasonal dams.
Severe or prolonged drying: Usable depth, sheltered routes and access to willow can disappear, narrowing the options for shelter, food and dam maintenance.

Homestake’s plants and wildlife depend on that changing network. Beavers are one of its keystone species: their dams help maintain ponds, wet ground and channels that support many other species. Reduced water and destruction of wetland vegetation can constrain their shelter, forage, movement and dam maintenance. Less beaver activity can then weaken water retention and the habitat it sustains.

Colorado researchers found beaver dams slowing seasonal groundwater decline beyond their ponds. Fens, wet meadows and beaver ponds are distinct habitats, but some share creek and groundwater connections: a 2018 Rocky Mountain fen study found higher, more stable water tables and greater storage with intact dams.

The water, vegetation and beaver connection · How a fen can share water with a pond

In North Saint Vrain Creek, Colorado, water-level and temperature records indicated a side-channel connection to the main creek in June and July 2015, while an off-channel pond kept relatively stable water levels through October (Wegener et al., 2017). On Colorado’s East River, beavers built a main-channel dam during the exceptionally low-water summer of 2018 (Dewey et al., 2022). These studies show how seasonal water levels change the habitat available to beavers.

Colorado studies and seasonal habitat evidence

One habitat network, different wildlife needs.

Amphibians need breeding water that lasts while their young develop. A five-species analysis across four Rocky Mountain parks, covering 2002-2011, estimated that amphibians were 34% more likely to use beaver-influenced wetlands. That measure is called occupancy: whether animals use a site. The finding connects beaver-shaped pond habitat with places amphibians use, making persistent breeding water part of the wider habitat story.

Willow and pond margins offer birds cover, nesting and feeding habitat. At Colorado’s Kimball Creek, beaver recolonization and more pools were associated with a greater amount of insects emerging from the water, measured as biomass. Insect richness, the number of kinds present, declined. The larger emerging food supply matters to birds and other animals feeding above the water. Fish depend on suitable depth, temperature and passage; moose feed on willow and wetland plants. The loss of a breeding pool, food source or refuge affects each species differently.

Regional amphibian study · Birds, insects, fish and wetland forage

What is documented in Homestake?

The September 23, 2026 BioBlitz snapshot records six beaver observations from June 2024 to July 2026: four Research Grade and two Needs ID. Inventory mapping from 1983 imagery identifies beaver-modified wetlands along lower Homestake Creek. CSU’s 2005 field assessment documents intricate stream-wetland connections and willow habitat.

Dated observations and historical inventory

Page updated October 15, 2026. Local observation snapshot: September 23, 2026.

Water has to last through the season.

The existing five-collector record shows about 88% of captured water was collected in May and June during water years 2014–2024. That is when runoff can connect channels and wet ground. The timing tells us when the existing system removes water; the studies here explain the habitat processes that make seasonal water important. See the collection geography and measured timing.

Young frogs and toads need their breeding ponds to stay wet long enough to reach metamorphosis. Fish need connected habitat and food carried by the current. A spring full of water can still give way to a difficult late summer.

CNHP documented boreal-toad breeding and Colorado River cutthroat trout in upper Homestake tributaries in 2000. These historical records put breeding pools and cold-water streams in the valley’s conservation story.

Pond duration and development · Historical toad record · Flow carries food

LIDAR TERRAIN ANALYSIS

The easy way through the valley gets harder.

The reservoir scenarios push the easiest modeled down-valley route onto the valley sides. With the same endpoints, the route climbs about 191-192 metres in total, compared with 73 metres under current conditions.

The easiest modeled route through the valley before a reservoir, between the same upstream and downstream points used in every comparison — Current terrain: the modeled route climbs about 73 metres in total.

Whitney D model with routes displaced around the reservoir onto the hillsides — Whitney D at modeled full pool: the route climbs about 191 metres in total.

Route comparison and terrain cost · Alternative routes and sensitivity

How route choice changes

The terrain model tests 200 possible paths between the same endpoints. Flooding reduces the choice of relatively easy routes and pushes the easiest route onto the valley sides. Routes remain connected through steeper or more difficult terrain.

All scenario maps, methods and results

A documented home for wildlife.

1,400 observations of plants, animals and fungi recorded by Homestake BioBlitz contributors as of September 23, 2026. Together, they reveal life across the project area and through the seasons.

Explore a few of the local records below. Open an entry for its date, location and source.

Recent wildlife observations

Moose10 observations, including 8 Research Grade records.

Where: Homestake BioBlitz project area
When: 2022 to 2026
About the record: Eight of the ten observations meet iNaturalist’s Research Grade identification and data-quality rules.

View supporting evidence

Boreal chorus frogOne Research Grade observation.

Where: Homestake BioBlitz project area
When: May 30, 2025
About the record: The observation meets iNaturalist’s Research Grade identification and data-quality rules.

View supporting evidence

American dipperA birdwatcher’s recorded sighting.

Where: Generalized Homestake locality
When: July 28, 2024
About the record: An eBird report shared through the Global Biodiversity Information Facility (GBIF).

View supporting evidence

Historical agency records

Boreal toadHistorical breeding documented in the upper tributaries.

Where: Upper Homestake tributaries
Report date: 2000
About the record: The Colorado Natural Heritage Program (CNHP) report documents historical breeding.

View supporting evidence

Colorado River cutthroat troutA historical population recorded in the upper tributaries.

Where: Upper Homestake tributaries
Report date: 2000
About the record: The Colorado Natural Heritage Program (CNHP) report records a historical population.

View supporting evidence

Moss identifications under review

Ribbed bog mossTwo observations; identification still under review.

Where: Homestake BioBlitz project area
When: 2022 to 2023
About the record: Both observations were submitted as ribbed bog moss and are awaiting further identification.

View supporting evidence

Narrowleaf peatmossOne observation; identification still under review.

Where: Homestake BioBlitz project area
When: July 11, 2026
About the record: The observation was submitted as narrowleaf peatmoss and is awaiting further identification.

View supporting evidence

How the observations were counted Photos and films

Inspect the ecological studies.

Study locations, findings and methods

These measured studies explain processes that connect water with habitat. Their locations, seasons and methods are part of each finding.

Moose stay close to water in a Colorado summer study

In Rocky Mountain National Park and nearby areas, 90% of the sampled summer locations were within about 285 metres of mapped water. The mean distance was about 110 metres.

Water and nearby willow and forest give moose a connected summer habitat mosaic.

Study setting and methods

21 adult moose; 1,672 GPS locations; June to August 2017 and 2018. Distance was measured to mapped flowing or standing water. The study used those observations to design an aerial survey.

Evidence and methods

Diversions change the streamside landscape

Across 37 Colorado stream reaches, researchers found smaller channel dimensions below diversions and vegetation shifting toward drier-site species.

Reduced flow can change the land along a creek as well as the water in it, shifting the plant community toward drier conditions.

Study setting and methods

North-central Colorado; 16 paired reaches and five unpaired reaches, with 100 vegetation sampling points per reach. Comparative field study.

Evidence and methods

Beaver dams influence water beyond the pond

Monitoring in Rocky Mountain National Park found that two beaver dams slowed seasonal groundwater decline across areas of 9 and 12 hectares, respectively.

A beaver pond can help hold water in the surrounding valley floor as summer flows recede.

Study setting and methods

Two dams along 1.5 kilometres of stream in one 58-hectare valley, monitored during 2002 to 2005.

Evidence and methods

Peat recovery takes longer than restoring water levels

At four previously drained Colorado fens, ditch blocking raised summer water tables. At the site restored 20 years earlier, disturbed surface peat still differed from reference peat.

Bringing water back and recovering the peat that holds it are different stages of recovery.

Study setting and methods

Four Colorado mountain fens restored 1 to 20 years before study. This research examined restoration of existing drained peat.

Evidence and methods

Flow carries food to fish

In northern California's upper Shasta River, drifting invertebrate prey approached zero below a diversion late in the season even though benthic biomass could be higher there.

Food available on the streambed and food carried to a fish can respond differently when flow is diverted.

Study setting and methods

Regional comparison outside Colorado: one diversion during wet 2019, with 13 sampling events and limited fish-pool replication.

Evidence and methods

Plants tell the story of wet ground.

Sedges, rushes, willows, wetland flowers and mosses help reveal how the valley holds water. Botanists identify plant communities alongside peat depth, groundwater and seasonal saturation. That combination distinguishes a groundwater-fed fen from a wet meadow or marsh and shows which functions protection must retain.

The recorded plants include species associated with wet ground. The ecology companion explains how recorded names were compared with the regional wetland-plant list. A plant’s wetland rating tells us where it tends to grow. Peat and water conditions tell us whether the ground is a fen, wet meadow or marsh.

Plant methods and record details

Follow the water downstream.

Groundwater-fed slopes, the valley floor and the creek exchange water in different ways. Changing creek stage can affect connected alluvial wetland soils; a hillslope-fed fen can respond to a different supply. Downstream of Whitney, Homestake Creek passes the Blodgett area and Hornsilver Campground before joining the Eagle River near Red Cliff. The complete map follows wetlands along that route. Their water can come from groundwater, the creek, or both, connecting the downstream habitat story to water taken upstream.

Explore the downstream wetland map

Keep the living valley in the decision.

The documented wetlands, peat, aquatic habitat and wildlife connections give Eagle County strong grounds to protect this valley under its resource standards. Save Homestake seeks denial wherever significant degradation would remain under an applicable standard after enforceable conditions.

Read the County evidence dossier

Open the evidence.

Wildlife observations through September 23, 2026, alongside habitat maps and ecological studies.