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Board approves amendment for Plumas Lake SR‑70 interchange design; staff say roundabouts could save up to $13 million
Summary
County public works presented an amendment to the Plumas Lake Boulevard/SR‑70 interchange design that proposes two roundabouts to reduce bridge and right‑of‑way costs; staff estimated up to $13 million in potential savings and the board approved the amendment.
Public Works described proposed value‑engineering changes to the Plumas Lake Boulevard/SR‑70 interchange (Phase 2) and requested approval of Amendment No. 3 to the agreement with Wood Rogers, Inc.
Sam Button said the project already has $35 million in federal construction funding and that a conceptual redesign moving the alignment slightly north and using two roundabouts could significantly reduce the size and cost of a railroad bridge, reduce right‑of‑way impacts (potentially saving several acres of rice land) and lower combined roadway and bridge expenses by an estimated up to $13 million. He noted the amendment increases design and retaining‑wall costs by roughly $3.6 million but could yield the larger estimated savings during construction.
Supervisors thanked staff and the consultant for identifying cost‑saving opportunities; the board approved the amendment by voice vote.
Next steps: staff will continue design work and refine property‑acquisition estimates; construction was described as targeted for 2026 or 2027 pending design and funding schedules.
