Foothill Gold Line: Pomona to Montclair (A Line Extension)

Alignment

This is the last piece of the Foothill Gold Line, which the Construction Authority has built in stages: Union Station to Pasadena in 2003, Pasadena to Azusa in 2015 and Glendora to Pomona in 2025. The Glendora–Pomona stage added nine miles and four stations and made the A Line 57.6 miles long. The remaining 3.3 miles run east from Pomona North along the Metrolink San Bernardino Line right-of-way, with two new stations at Claremont and Montclair, both shared with Metrolink. The agency now treats it as two separate projects.

The Pomona to Claremont extension (2.3 miles) is entirely in Los Angeles County. The Metrolink and freight tracks will move to the southern half of the corridor to make room for two light rail tracks, so four tracks will run through Claremont. The A Line will cross Indian Hill Boulevard on a bridge while the Metrolink and freight tracks stay at street level. The Claremont A Line station will be a center-platform station roughly where the Metrolink station is today, between Indian Hill Boulevard and College Avenue. The Metrolink platform will move east of College Avenue, and a 539-space parking facility will serve both. All street crossings will get safety improvements. When finished, the Construction Authority will hand the line to LA Metro to operate.

The Claremont to Montclair extension (about 1 mile) would continue into San Bernardino County to the Montclair Transit Center, where Metrolink already stops. It is on hold because the San Bernardino County Transportation Authority (SBCTA) withdrew its funding and stopped negotiating with the Construction Authority in September 2025.

Updates

2026-09 — Montclair sues SBCTA over abandoned extension

The City of Montclair sued SBCTA in state superior court, alleging that dropping the extension violated the county’s Measure I sales-tax ordinance and SBCTA’s long-standing commitment. The suit also alleges discrimination in moving funds toward Metrolink. Montclair puts its costs from the cancellation at $120M. SBCTA said its board takes fiscal responsibility seriously.

2026-05 — Construction manager hired; final design under way

On May 27 the Construction Authority awarded the construction manager contract to SSH Joint Venture (Skanska, Stacy and Witbeck, and Herzog), with $6.3M authorized for an 18-month preconstruction phase. Under the Construction Manager at Risk method, SSH may negotiate a price to build the project once design reaches about 85%, which is expected in fall 2027. Major construction could begin in late 2027 and take about four years. By summer, Parsons was taking the design from about 30% to 60%.

2026-04 — SBCTA opposes bill for a new Montclair authority

SBCTA’s board voted on April 1 to oppose AB 1678, which would create a new “Claremontclair Authority” to build the Claremont–Montclair segment. SBCTA objected that the bill would reduce its control over county transportation and could make it pay operations and maintenance costs it had not negotiated. Since 2025 SBCTA has instead pursued better Metrolink service to Montclair.

2026-01 — $60M design contract awarded to Parsons

The Construction Authority board unanimously awarded Parsons Transportation Group a six-year, $60M contract to take the Pomona–Claremont design from about 30% to approved-for-construction drawings. It was the first of two contracts under the Construction Manager at Risk method. The board also released the request for proposals for the construction manager.

2025-09 — Glendora–Pomona opens as Montclair loses county support

Passenger service on the Glendora–Pomona segment began on September 19, 2025, with stations in Glendora, San Dimas, La Verne and Pomona. Earlier that month SBCTA’s board voted 15–11 to stop negotiating with the Construction Authority, withdraw the money needed to design the Montclair segment, and study other transit options for Montclair using the $37M in local funds it had held. The Construction Authority then split the final segment so that Claremont could proceed on its original schedule.

2024-10 — Metro commits $798M to the Claremont segment

On October 31, 2024 the Metro Board unanimously approved a $798M funding agreement, using state SB 125 transit money, for the Los Angeles County portion of the final segment, including the Claremont station.