Red Deer River (Waskasoo Seepee) Water Storage Proposals

Off-Stream Storage vs. the Ardley Dam: A Comparative Analysis of Water Storage Options on the Red Deer River

• The Ardley Dam is an on-stream reservoir proposed for the Red Deer River about 40–70 km east of the City of Red Deer, now in a $4.5-million provincial scoping-and-feasibility study (Hatch Ltd., October 2024 to fall 2026); unofficial estimates put it at four times the size of Gleniffer Lake and $2–4 billion, but no government has committed to building it and key specifics (storage volume, dam height, footprint) remain unpublished.
• Off-stream storage — diverting high flows into an adjacent reservoir — generally offers lower environmental impact (better fish passage, sediment transport, and instream-flow protection) but typically yields less total storage, needs pumping energy, and on the Red Deer has mainly been proposed downstream (the Special Areas Water Supply Project), which has stalled at the post-EIA-terms-of-reference stage with poor benefit-cost results.
• The honest bottom line: for the Red Deer system, the choice is not purely either/or. The Red Deer is the least-allocated sub-basin in a heavily-allocated South Saskatchewan River Basin, so new storage could unlock real drought resilience — but the case for a multi-billion-dollar on-stream dam is unproven pending the 2026 feasibility study, and off-stream and non-structural alternatives (conservation, natural infrastructure, demand management) have not been rigorously compared head-to-head by the province.

Key Findings

1. The Ardley Dam is a century-old idea now being formally studied again. A diversion/storage project near the hamlet of Ardley dates to a 1914 plan by irrigation engineer William Pearce, was studied in the 1940s–60s (including by the Saskatchewan-Nelson Basin Board), and was shelved repeatedly. Budget 2024 allocated $4.5 million for a feasibility study; Hatch Ltd. was retained and work runs October 2024 to fall 2026. The study is led by Alberta Environment and Protected Areas (Minister Rebecca Schulz, later Grant Hunter).

2. The project is being driven by municipalities and irrigation interests, not by a single proponent committed to construction. The Red Deer River Municipal Water Users Group (RDRMUG) — which represents about three dozen municipalities serving 350,000 residents from the river's Clearwater County headwaters to the Saskatchewan border (per the Red Deer Advocate, April 10, 2026) — has lobbied for additional storage for years, arguing Gleniffer Lake/Dickson Dam is the system's "only lever to pull" in drought and provides only about one year of supply before running low.

3. Scale and cost are large but unofficial. Rudy Friesen, RDRMUG's executive director, told Olds town council on May 5, 2025 (reported by The Albertan) that "the cost to build the Ardley dam and reservoir could range between $2 and $4 billion," that "conventional wisdom" says it would take about 25 years to build, and that "this reservoir would be about four times the size of Gleniffer." The province has identified three options (Low, Medium, High) but has not published storage volumes, surface areas, or dam heights — these are outputs pending the fall 2026 report.

4. Off-stream storage is the lower-impact alternative in principle, and is the model used for the Special Areas Water Supply Project (SAWSP) and Springbank (SR1). Off-stream reservoirs capture only excess/high flows via diversion, leaving baseline flows in the river — reducing harm to fish passage, sediment transport, and riparian habitat. But they require pumping energy, lose water to evaporation, and on the Red Deer have been proposed mainly as downstream irrigation delivery (SAWSP), which stalled.

5. The water-management context is decisive. The Bow, Oldman and South Saskatchewan sub-basins have been closed to new surface-water allocations since 2006; the Red Deer River remains open and lightly allocated, making it the basin's main remaining source of flexibility — and the focus of inter-basin-transfer concerns. Alberta must also pass 50% of South Saskatchewan Basin natural flow to Saskatchewan under the 1969 Master Agreement on Apportionment.

6. Recent drought (2023–2024) catalyzed the current policy push. Alberta signed its largest-ever water-sharing agreements in 2024 and launched a $125-million Drought and Flood Protection Program plus a province-wide Water Storage Opportunities Study of more than 100 sites.

Details

The Ardley Dam proposal

Location and configuration. The study area covers a roughly 40-km stretch of the Red Deer River from just east of the City of Red Deer to the Content Bridge at Highway 21, spanning Lacombe County, Red Deer County, and the County of Stettler No. 6. The reservoir would be an on-stream impoundment near the hamlet of Ardley, variously described as 40–70 km east of Red Deer. The province is evaluating three options — a "Low" (smallest footprint), "Medium," and "High" reservoir.

Purpose. The province lists irrigation, drought management/water security, flood protection, and supply for growing communities and industry as the rationale. The Red Deer River supplies water to hundreds of thousands of people including Red Deer, Drumheller, and many smaller communities, plus irrigation, industry, and oil/gas. About 46% of allocated consumption in the Red Deer basin is for irrigation and about 29% for industrial/fossil-fuel uses. RDRMUG argues new storage could nearly double the licensing capacity of the Red Deer River.

Size, cost, and timeline. Unofficial RDRMUG figures (Rudy Friesen to Olds town council, May 2025): ~4× Gleniffer Reservoir, $2–4 billion, and about 25 years to build (though Friesen noted Springbank is expected to take ~10 years). By comparison, Gleniffer Lake (behind the 1983 Dickson Dam) has a maximum storage of about 203,100 dam³ (roughly 203 million m³) with a surface area of 17.6 km². The province has not released official Ardley figures. Whether the dam would generate hydroelectricity (like Dickson Dam) is undecided — the province has said there is "no commitment to that" at this stage. A decision on whether to proceed will follow the fall 2026 feasibility report; detailed engineering, design, and regulatory approvals would come only after.

Status. As of mid-2026, the project is in the feasibility phase with field studies (geotechnical, vegetation, wildlife, fish habitat, groundwater, cultural resources, drone/bathymetric surveys). Public engagement ran through summer 2026 (online survey to July 30, 2026; in-person sessions July 14 and 16, 2026). The County of Stettler council and Rural Municipalities of Alberta have voiced support; the City of Red Deer has not taken a formal position.

Environmental and social concerns

The Red Deer River Watershed Alliance (RDRWA) is explicitly neutral ("does not have a position on the Ardley dam") but its associated experts have flagged the loss of ecosystem services. Tricia Stadnyk, Canada Research Chair in hydrology, told CBC News that cost-benefit analyses do "a poor job" valuing the loss of natural-state ecosystem services: "Where we do a poor job these days — and this is globally, not just here — is in quantifying the loss of the benefits of the ecosystem service of the land in its natural state... wetlands, beavers, things that depend on natural water level fluctuations not being flooded — all of that is lost when we flood land."

Specific concern categories:

• River valley, habitat, and wetlands. Flooding the valley would inundate riparian cottonwood communities and wetlands. General concerns about peat-forming wetlands such as fens are relevant because flooding raises water tables and kills peatland vegetation, releasing stored carbon — though the specific presence of a notable tamarack fen in the Ardley footprint could not be confirmed in available public sources.
• Fish passage and sediment. On-stream dams block fish migration, alter flow and temperature regimes, and trap sediment and nutrients needed by downstream ecosystems — impacts the RDRWA and provincial sources both acknowledge.
• Greenhouse gas emissions. Reservoirs emit CO₂ and methane from decomposing flooded organic matter. Per Soued et al., Nature Geoscience (2022), reservoir methane emissions are rising and "accounted for 5.2% of global anthropogenic methane emissions in 2020." Cold-climate reservoirs emit substantially less than tropical ones, but emissions are not zero and persist for decades.
• Agricultural land and infrastructure. The reservoir would inundate private and leased Crown agricultural land; infrastructure near the valley (roads, bridges, the Highway 21 Content Bridge) could be affected.
• Indigenous interests. The province says it will "work directly with Indigenous communities and organizations." Treaty 7 First Nations participated in the 2024 water-sharing agreements. Specific Indigenous positions on Ardley were not publicly documented in the sources reviewed.

Off-stream storage alternatives

How it works. A diversion structure pulls water from the river during high flows into an adjacent (off-channel) reservoir; baseline and low flows remain in the river. This is the model for the Springbank Off-Stream Reservoir (SR1) on the Elbow River (a flood-control diversion completed before the 2025 flood season) and California's proposed Sites Reservoir (1.5 million acre-feet, capturing only excess Sacramento River flows). Off-stream designs "avoid many of the negative environmental impacts associated with on-stream dams" by leaving water in the river for fish and wildlife.

On the Red Deer specifically. The principal off-stream proposal is the Special Areas Water Supply Project (SAWSP) — a pump station and 97.5-km pipeline diverting Red Deer River water (near Stettler/Nevis) at a design rate of 2.5 m³/s to storage reservoirs at the headwaters of Sounding and Berry Creeks, distributed through existing streams, improved channels and canals to the drought-prone Special Areas. Proponent: Alberta Transportation with the Special Areas Board.

• Status: Final Terms of Reference for the EIA were issued March 22, 2018; the registry then shows "Awaiting submission of the EIA/Application." The project appears dormant/stalled, with no evidence of formal approval, cancellation, or recent (2023–2026) activity.
• Cost and economics: Most recent estimate ~$410.3 million (2018), with annual operating costs ~$5.5 million (~$3.2 million energy). A government-commissioned socioeconomic review by Klohn Crippen Berger, as cited by the Alberta Wilderness Association, found costs far exceeded benefits: "Even in the optimistic 'high supply' scenario, only 12.8 cents is produced for every dollar invested into this project, and total costs are expected to exceed regional benefits by $704 million. In the 'low supply' scenario, total costs exceed regional benefits by $708 million."
• Environmental footprint: Per the Alberta Wilderness Association citing the project EIA, "as it is currently designed, 25% of the SAWSP area overlaps with native grasslands," and roughly 11% of the local study area is wetlands; the AWA opposed it, arguing it would benefit relatively few people at high cost, energy, and environmental risk, and that the project "has been studied many times and was abandoned for good reason."

There is also a separate, newer MD of Acadia & Special Areas Joint Irrigation Project (~108,000 acres, distinct off-stream reservoirs), which is in feasibility — easily conflated with SAWSP but administratively separate.

Storage potential and cost of off-stream generally. Off-stream reservoirs are typically sized smaller than major on-stream dams and their cost is dominated by excavation/embankment and (where needed) liners, plus ongoing pumping energy. They trade lower environmental impact and flexibility for higher per-unit operating cost and lower total yield.

Direct comparison: Ardley (on-stream) vs. off-stream storage

Dimension	On-stream (Ardley)	Off-stream
Water yield/reliability	Higher total storage; can capture full range of flows; "4× Gleniffer" claimed	Lower; limited to diverted high flows; depends on diversion capacity
Capital cost	Very high ($2–4B unofficial)	Lower per project (SAWSP ~$410M) but poor benefit-cost on Red Deer
Operating cost	Lower (gravity); possible hydro revenue	Higher (pumping energy)
Fish passage	Blocks migration unless mitigated	Largely preserved (river left intact)
Sediment transport	Trapped behind dam	Largely maintained in river
Riparian habitat	Valley/cottonwoods inundated	Adjacent land affected, river corridor spared
GHG emissions	Reservoir CO₂/CH₄ from flooded land	Similar reservoir emissions but smaller flooded area; plus pumping energy
Evaporation	Large surface = significant loss	Smaller surface, but can be deep/compact to limit loss
Flood control	Strong (controls mainstem outflows)	Moderate (diversion can shave peaks, e.g., SR1)
Drought/water security	Strong (large carryover storage)	Moderate (depends on fill opportunities)
Land requirement	Large valley inundation	Smaller, sited on less-sensitive land
Flexibility	Fixed once built	Greater operational flexibility

The province's own framing (RDRWA Q&A) favors a single large reservoir on cost-efficiency grounds: "Larger reservoirs generally provide more total storage and operational flexibility at lower costs relative to a series of multiple smaller reservoirs." Critics counter that this calculus omits ecosystem-service losses and that the comparison to off-stream/natural-infrastructure options has not been done rigorously — the Ardley study's own scope is limited to the on-stream reservoir, with natural-infrastructure work directed to separate programs.

Broader water-management context

• Allocation. Since 2006, the Bow, Oldman and South Saskatchewan sub-basins are closed to new surface-water allocations; the Red Deer River sub-basin has a low degree of allocation and remains open, making it the key remaining source of new water in the SSRB. As Bow/Oldman use intensifies, the Red Deer is expected to "contribute more" to meeting downstream needs.
• Apportionment. Under the 1969 Master Agreement on Apportionment, Alberta must pass 50% of the SSRB's natural flow to Saskatchewan; as Red Deer allocations are more fully used, the share passed downstream is predicted to decline toward 50–60%.
• Climate/drought. Climate projections for the basin point to earlier snowmelt, higher spring flows, and lower summer/fall/winter flows — more extreme droughts and floods. The 2023–2024 drought saw dozens of water-shortage advisories province-wide. A 2014 Irrigation Council-funded study concluded there is "limited opportunity for additional water storage in southern Alberta" within current regulations and apportionment — a finding that cuts against large new builds.
• Special Areas needs. The Special Areas (constituted after the 1930s Dust Bowl) are chronically drought-prone; "drought-proofing" via reliable Red Deer supply is the long-standing rationale for SAWSP.

Recent developments (2024–2026)

• Budget 2024: $4.5M for Ardley study; a Drought and Flood Protection Program of $125 million over five years ($25 million per year from 2024-25 through 2028-29, announced by Minister Rebecca Schulz on March 4, 2024); and $35M+ for water management/wetlands.
• 2024: largest water-sharing agreements in Alberta history (Red Deer, Bow, Oldman, Southern Tributaries); 37–38 major licensees representing up to 90% of Bow/Oldman and 70% of Red Deer allocations; activated May–October 2024, expired end of 2024.
• Dec 2024: province-wide Water Storage Opportunities Study (100+ sites; MPE/Englobe), expected 2025.
• 2025: Eyremore Dam (near Brooks) and Belly River/Waterton-St. Mary feasibility studies (WSP Canada); Dickson Dam spillway upgrades completed.
• 2026: Ardley feasibility field studies and public engagement; consultant report due fall 2026; no decision timeline set.

Recommendations

1. Treat the fall 2026 Hatch feasibility report as the key decision gate. Until it publishes storage volumes, dam height, footprint, yield, and a transparent benefit-cost analysis (including ecosystem-service losses and GHG emissions), the $2–4 billion and "4× Gleniffer" figures should be treated as advocacy estimates, not facts. Benchmark to change position: a credible, peer-reviewed yield figure and a benefit-cost ratio above ~1.0 that internalizes environmental costs.
2. Demand an explicit alternatives comparison. The province should require the study (or a parallel one) to compare the on-stream Ardley option against (a) off-stream storage on the Red Deer, (b) raising/optimizing Dickson Dam/Gleniffer, (c) demand management and irrigation efficiency, and (d) natural infrastructure (wetlands, headwaters/riparian restoration). The current scope's exclusion of these is the analysis's biggest weakness.
3. Resolve the inter-basin-transfer question early. RDRMUG's "very high level of concern" about inter-basin transfers should be addressed transparently: is Ardley storage intended primarily for the Red Deer basin, or to backstop Bow/Oldman/Special Areas demand? This determines who benefits and who pays.
4. Engage Indigenous nations and downstream Saskatchewan interests before, not after, a build decision. Apportionment obligations and Treaty rights are material; the absence of documented Indigenous positions is a gap to close.
5. For near-term drought resilience, prioritize lower-regret measures — water-sharing agreements, conservation, efficiency, and natural infrastructure — which deliver benefits within years rather than the 10–25-year horizon of a megadam.

Caveats

• Key Ardley specifics are unpublished. No official storage volume, dam height, footprint, or cost exists yet; the "4× Gleniffer" and "$2–4 billion" figures are RDRMUG (Rudy Friesen) estimates carried in local media, not government/engineering-confirmed numbers.
• The tamarack fen concern could not be verified in the specific Ardley context from available public sources; it should be checked against the forthcoming environmental field surveys.
• SAWSP status is "dormant/stalled," inferred from the regulatory registry and advocacy sources — no explicit 2023–2026 government statement of cancellation or revival was found.
• Off-stream vs. on-stream environmental comparisons are partly drawn from analogues (Springbank, Sites Reservoir) and general reservoir science, not Red Deer-specific modeling.
• Drought conditions improved in 2025–2026 relative to 2023–2024, which may reduce political urgency; conversely, climate projections argue for long-term preparation. Both framings appear in the sources.
• Some figures (Gleniffer capacity, Dickson Dam height) are corroborated across sources but precise values vary slightly by source.