Code amendment · Planning application
Canyon County confirms Nampa's area of impact, leaves disputed Boise River strip out
The county commissioners adopted a final boundary map for Nampa's area of impact, the unincorporated land the city expects to grow into, and amended county code to match on Nov. 19. A strip near the Boise River shared with Star was left outside both cities' areas of impact.
Location
This filing changes the city's rules rather than a specific site, so there's nothing to map.
From the filing
The application's description as it appears in Canyon County's record. See the official record
The City of Nampa asked Canyon County to confirm and reestablish its existing area of impact, the unincorporated land where the city expects to grow and may later annex, between the Boise River on the north, the Ada County line on the east, Lake Shore Drive on the south, and Lake Lowell and Caldwell's boundary on the west. The staff report notes no change to the current boundary is requested, and the City of Star has also asked that an area just south of the Boise River be added to its own area of impact, which overlaps Nampa's.
The applicant, City of Nampa, requests an ordinance update to comply with State Law 67-6526, by confirming the existing Area of Impact. The City of Nampa requests that the Canyon County Board of Commissioners confirm and reestablish Nampa’s existing Impact Area boundary that is roughly bound by the Boise River to the north between Madison Rd. and N. Can Ada Rd., the county line to the east, Lake Shore Dr. to the south, and Lake Lowell and Caldwell’s previously established Impact Area boundary to the west.
Project name on file: Nampa Area of City Impact
Timeline
Nov. 19, 2025
Public hearing: Canyon County Board of County Commissioners
Nov. 19, 2025
Approved
Canyon County Board of County Commissioners: Approved.
Documents
Site plans
- Download Updated Nampa area of impact map
Map of the proposed updated Nampa area of impact, a draft not yet approved by the Board of County Commissioners, with a legend of city limits, roads and rail.
Nov. 18, 2025 · 1 page · 5.6 MB
Staff reports
- Download Staff report on City of Nampa area of impact confirmation
Planning staff report for the Board of County Commissioners on Nampa's request to confirm its existing area of impact under updated Idaho Code 67-6526.
Nov. 18, 2025 · 320 pages · 89.0 MB · Staff Report
- Download Staff report on City of Nampa area of impact confirmation
Planning staff report for the Board of County Commissioners on Nampa's request to confirm its existing area of impact under updated Idaho Code 67-6526.
Nov. 18, 2025 · 320 pages · 89.0 MB · Staff Report
Decisions
- Download Findings of fact, conclusions of law and order
Board of County Commissioners decision adopting the Nampa area of impact boundary map as Exhibit E.3 and amending the county area of impact ordinance.
Nov. 18, 2025 · 8 pages · 1.9 MB · Decision
- Download Nampa area of impact ordinance
Ordinance amending Canyon County Code chapter on City of Nampa areas of impact, confirming and modifying the area of impact boundary per Idaho Code 67-6526.
Nov. 18, 2025 · 8 pages · 1.3 MB · Decision
Other documents
- Download Nampa impact area presentation for Canyon County hearing
Slides presented by the City of Nampa on its impact area, continued to the Nov. 19, 2025 Board of Canyon County Commissioners hearing, noting state requirements and county staff recommendation for approval.
Nov. 18, 2025 · 10 pages · 2.0 MB
- Download Nampa impact area presentation for Canyon County hearing
Slides presented by the City of Nampa on its impact area, continued to the Nov. 19, 2025 Board of Canyon County Commissioners hearing, noting state requirements and county staff recommendation for approval.
Nov. 18, 2025 · 10 pages · 2.0 MB
- Download Updated Nampa area of impact map
Map of the proposed Nampa area of impact for the Board of County Commissioners hearing, marked as not yet approved and revised in November 2025.
Nov. 18, 2025 · 1 page · 5.6 MB