City council tentatively approves Cascade Crest subdivision after LUBA remand; conditions added on sidewalks and stormwater

Corvallis City Council voted 6–3 on Feb. 3 to tentatively approve the Cascade Crest subdivision — a 10‑lot, roughly 3‑acre low‑density residential subdivision along Brook Lane Drive that was remanded to the city by the Land Use Board of Appeals (LUBA) for additional findings on three issues: sidewalk placement, stormwater detention and water‑quality facilities, and stormwater impacts on adjacent properties.

The LUBA remand narrowed the council’s review to those three items. City planning staff told council that the applicant supplied a December 2024 stormwater design report with technical calculations showing pre‑ and post‑development runoff rates that meet the measuring standards in Appendix F of the (1993) Land Development Code and related King County stormwater standards. Staff said the applicant also provided a site plan that shows a west‑side (collector‑side) sidewalk along Brook Lane Drive, and recommended findings 1–28 and the conditions of approval in Exhibit A to resolve the remand.

Why it matters: the project was previously approved by council, was appealed to LUBA, and LUBA agreed with the city’s approval but remanded the three issues. Those three items determine whether the earlier approval can be finalized. The remand centers on (1) whether a sidewalk omitted by the original approval must be built on the west side of Brook Lane Drive or whether an existing (east side) route is adequate, (2) whether the proposed combined detention/swale satisfies quality and detention standards, and (3) whether the record adequately addressed off‑site stormwater impacts — including on the Marys River natural areas downstream.

Most important facts - Staff recommended the council accept the applicant’s additional materials and adopt findings and conditions that require the developer to: construct the required west‑side sidewalk (with allowances for a public access easement where right‑of‑way is too narrow); separate combined swales into two distinct facilities (one detention and one water‑quality facility); and add findings addressing off‑site stormwater impacts (findings 11–21 and 25–28, plus revised conditions 4, 7 and 22). - The applicant’s December 2024 stormwater report includes calculations (per Appendix F) showing post‑development runoff rates that do not exceed pre‑development peak rates for the required design storms; staff and the applicant nonetheless required separate detention and water‑quality facilities and a condition to memorialize that requirement in the final approval. - The proposed west‑side sidewalk would require some grading and removal of two trees within an area that staff described as the site’s conservation easement; staff corrected a clerical error in the record about tree trunk diameter measurements (the record should read 1½‑inch trunk diameter as the reference in condition language). - Public testimony opposed approval unless stormwater routing and potential erosion are fully resolved. Speakers emphasized concerns about runoff from Lots 6–10 and potential impacts to the Marys River floodplain and nearby oak stands.

What proponents and applicants said - David Dodson, the planning consultant for the applicant, told the council the applicant accepts staff’s revised findings and the requirement to separate detention and water‑quality facilities. Dodson and the applicant’s civil engineer (not present) told staff and council the detention facility can be designed to meet city performance standards; Dodson said the high point on the site allows roof and site drainage to be routed to the proposed detention location and estimated the detention storage requirement at about 4,500 cubic feet (applicant estimate, Dec. 2024 stormwater report). The applicant proposed to place a 6‑foot sidewalk on the west side at slopes staff says stay within code (applicant said the sidewalk would be constructed at 5% or less where feasible).

What opponents and neighbors said - Several neighbors and the chief petitioner on the original LUBA appeal argued the supplemental materials do not yet prove…