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Mountain Ash Cross Valley Link Scheme


The multi-million pound Cross Valley Link Scheme has long been an aspiration for the community and the Council, to vastly improve traffic flow in Mountain Ash and the wider Cynon Valley. The major scheme is due for completion by late summer 2020, and will see a new road link built from Cwm Cynon Industrial Estate to Miskin Road, over the River Cynon and Aberdare-Cardiff railway line.

Cross Valley Link - JuneThis drone image from mid-June 2020 shows the latest construction progress

This will be achieved through a 60-metre bridge, which will link traffic on the A4059, the arterial route through the Cynon Valley, and the B4275 on the opposite side of the river. This will benefit thousands of road users every day, especially during peak travel times.

A number of large schemes have preceded the main construction phase of the scheme, which got underway in Summer 2018. This includes carriageway improvements at Cardiff Road, major A4059 junction works to improve its capacity, a retaining wall construction at Cardiff Road, and demolition work at Miskin Cottages. More information is included below.

The project is being funded through #RCTinvest Programme, and has also received significant support from the Welsh Government through a number of grants.

Major project milestones to date

Concrete pour to bridge deck

Dec 2019 update1
Concrete Pour main

The significant concrete pour to the bridge deck started during early December 2019, utilising more than 350m3 of concrete. Read more…

Installation of bridge beams




A weekend of work in late September 2019 saw six pairs of large bridge beams lifted into place over the river and railway line. Read more...

Summer holiday works 2019




Further retaining wall construction and work to the parking area at Glyngwyn Street, utilising a road closure at Penrhiwceiber Road scheduled for the school holiday to minimise disruption. Read more…

Main construction phase

1. OCT 2018 - sod cutting

1. OCT 2018 - sod cutting 4

1. OCT 2018 - sod cutting 5

A sod cutting ceremony took place in October 2018, to mark the main construction phase getting underway. This followed site clearance on both sides of the river, piling rig installation and excavations to the railway level. Read more...

A4059 junction improvements

2. JUNE 2018 - A4059 complete 2

2. JUNE 2018 - A4059 complete 3

2. JUNE 2018 - A4059 complete 6

Significant improvements to the A4059/Cwm Cynon Industrial Estate junction were completed in May 2018, and the new traffic signals were commissioned. The major works have vastly increased the junction’s capacity. Read more...

Public exhibitions for traffic restrictions

3. MAY 2018 exhibition 2

3. MAY 2018 exhibition 3

3. MAY 2018 exhibition

The Council hosted a public exhibition at Miskin Baptist Church to display the necessary traffic arrangements for the scheme’s main construction phase, and the permanent arrangements upon completion. Read more...

Retaining wall at Cardiff Road

4. JAN 2018 retaining wall

4. FEB 2018 retaining wall

4. JUNE 2018 retaining wall

A new retaining wall at Cardiff Road was constructed as part of the A4059 junction works. The images show the wall during various phases of construction throughout the first half of 2018 – in January, February and June.

Demolition of Miskin Cottages

5. NOV 2017 miskin cottages demolition (4)

5. OCT 2017 - miskin cottages demolition (1)

5. OCT 2017 - miskin cottages demolition (2)

In order to accommodate the scheme, the Council completed the compulsory purchase of two buildings at Miskin Cottages, to be demolished. The two buildings were demolished over six weeks, during October and November 2017.

Major Cardiff Road improvements

6. OCT 2017 - Cardiff Road Mountain Ash -12

6. OCT 2017 - Cardiff Road Mountain Ash 13

6. OCT 2017 - Cardiff Road Mountain Ash 14

A major scheme to improve a section of Cardiff Road, nearest the Industrial Estate, was completed during October 2017. The works delivered a new carriageway layout as well as road re-surfacing and new street lighting. Read more...

Site boundary

This image was taken in May 2017, just before works were about to begin. It shows the majority of the work site including the A4059 junction, Cardiff Road and the Cwm Cynon Industrial Estate.

7. MAY 2017 - before project


Summer holiday road closure from July 25, 2020, will allow Miskin Road to reopen in August. Read more...Diversion-Map---Cross-Valley-Link

The Mountain Ash community can now submit suggestions for the bridge’s official new name. Read more...

Name the Cross Valley

Following completion of the concrete pour, the Council Leader visited the site on December 20 and was able to walk across the length of the bridge. Read More...

Mountain-Ash-Cross-Valley-Link-Walking-OverFrom December 5, work began on the concrete pour to the bridge deck – to be carried out over two phases of work. Read more here

Concrete pour PR

The temporary traffic lights at Miskin Road, near the Mount Pleasant Public House, have now been removed. Two-way traffic flow was re-established over the weekend (October 12-13)

roads two

Successful weekend of work to install bridge beams READ MORE…


Major work will take place in late September 2019 to install large bridge beams READ MORE…Air-view-shot-Cross-Valley

Full details of the school summer holiday road closure to progress works (July/August 2019).READ MORE…


Progress report and new drone footage from the site (April 2019) READ MORE...


Members of Mountain Ash RFC under-12s visited the site in February 2019, as contractor Walters-Sisk is sponsoring the team this season


Pupils build their own bridges with Cross Valley Link contractor READ MORE...

Cross valley school projectBridgeBuilders-59 (2)BridgeBuilders-7 (2)

The Council’s contractor for #MountainAsh Cross Valley Link, Walters-Sisk, has given toys to local primary schools for Christmas 2018 – Pengeulan, Miskin and Darranlas. The toys were handmade by Sisk apprentices in Dublin

MACVL christmas