Montgomerie Avenue Stormwater Management Project
Overview
The Minnehaha Creek Watershed District (MCWD) and the City of Deephaven have partnered on a stormwater management project, to reduce local flooding and improve water quality in Lake Louise and Robinson’s Bay on Lake Minnetonka. The City is leading the project with technical and financial assistance through MCWD’s Land and Water Partnership (LWP) Program.
By constructing an infiltration basin, the Montgomerie Avenue Stormwater Management Project will capture, store, and treat stormwater runoff from the surrounding 5.6 acres. The system is designed to reduce phosphorus loading to Lake Louise, which flows into Robinson’s Bay, by approximately 6 pounds annually. MCWD and the City identified the project through a citywide assessment of regional water resource improvement opportunities. MCWD provided technical support to evaluate project costs and benefits, contributed $125,000 through the LWP Program, and helped the City secure outside grant funding for the project.
Project Updates
Winter 2025-2026
The Board of Managers ordered the Montgomerie Avenue Stormwater Management Project at its November 20, 2025, meeting. The City of Deephaven anticipates beginning construction in Spring 2026.
Project Timeline
Planning Phase
Planning Phase
March 2023 — City of Deephaven coordinates early with MCWD
Spring 2023 — City and MCWD conduct a citywide project opportunity scan
Summer 2023 — City and MCWD identify Montgomerie Avenue project
Design Phase
Design phase
Summer 2023 — Hennepin County awards opportunity grant
February 2024 – City of Deephaven submits an official Notice of Interest for LWP Program funding
July 2024 — MCWD’s Board of Managers holds a public hearing for a proposed minor Capital Improvement Plan amendment and for Board consideration of project ordering
August 2024 — MCWD’s Board adopts a minor Capital Improvement Plan amendment through Resolution 24-045
May 2025 — Watershed-Based Implementation Funding is awarded from the Board of Water and Soil Resources
November 2025 — MCWD’s Board orders the project through Resolution 25-070
Winter 2025/2026 — City completes partnership agreements, project design, permitting, and community engagement
Construction Phase
Construction phase
Spring 2026 — City of Deephaven begins construction
Project completion
Project completion
Summer 2026 — Complete
By the Numbers
5.6
acres
of stormwater captured and treated
6
pounds
of phosphorus reduced annually
1,034
pounds
of suspended sediment reduced annually
16,904
Cubic feet
of local flood storage created
Project Highlights
- Construction of a stormwater infiltration basin
- Additional flood storage, decreasing local flood risk
- Improved water quality in Lake Louise and Robinson’s Bay
- Collaboration between the City of Deephaven and MCWD
All metrics anticipated upon project completion.
Partnership
The project was made possible through early planning and coordination led by the City of Deephaven. This early collaboration allowed MCWD to support project scoping, feasibility, and design, ensuring a seamless integration of both partners’ goals.
Funding
MCWD Project Cost: $125,000
MCWD contributed $125,000, or approximately 20% of the cost for the project’s water quality improvement features, through the Land & Water Partnership Program. The project also received $45,034 in grant funding through the Hennepin County Opportunity Grants program, as well as $200,000 of Watershed-Based Implementation Funding. The City of Deephaven provided the remaining project cost of $173,839.
