The A6121 is a short cross-country road in the counties of Lincolnshire and Rutland, England. It forms the principal route between Bourne and Stamford and the A1 in Lincolnshire, continuing on through Ketton in Rutland to its junction with the A47 at Morcott. Its south-western end is at and its north-eastern end is at. The road has increased in importance with the rapid expansion of housing in this part of South Kesteven. The road is deemed to start from its junction with the A47 to the west of the A1, therefore it is allocated to Zone 6 and numbered accordingly. It was the only A road in the Stamford area that was not a trunk road before the A16 was de-trunked in 2010 to become the A1175.
Route
Morcott - Stamford
It begins in Morcott at the staggered crossroads with the east-west A47 and the B672, becoming Stamford Road near the '. It is crossed here by the Rutland Round and from here to Tinwell, west of Stamford, it follows the River Chater. From South Luffenham to Caldecott, the A6121 and B672 also follow the Rugby branch of the Syston and Peterborough Railway, which opened in 1851. The road passes through South Luffenham as Stamford Road, with a crossroads for the village and Barrowden, and the '. To the east of the village is the Wireless Hill roundabout for North Luffenham and the A47. From here the road follows the main Syston and Peterborough Railway, which it passes under a mile to the east, north of Luffenham Heath Golf Club, and the point where the road crosses the River Chater at Foster's Bridge. On the North Luffenham / Ketton parish boundary there is a junction for North Luffenham. at Ketton It enters Ketton as Luffenham Road, passing a crossroads for Edith Weston, and Geeston and Aldgate. On the eastern exit of the village is the large Ketton Cement Works, to the north. A railway branch line for the passes under the road, and further east is a junction with Steadfold Lane, for Great Casterton, to the north. In Tinwell it passes church, to the south, and the Crown Inn. West of Tinwell, the River Chater joins the River Welland, a few hundred metres to the south. Entering Tinwell, it meets Casterton Lane to the north. On the eastern side of the A1 cloverleaf it enters Stamford, South Kesteven, and Lincolnshire as Tinwell Road. This entry into Stamford has the best view of the Welland Valley.
Stamford - Bourne
It crosses the former Roman roadErmine Street at the junction of Roman Bank to the north and Waterfurlong to the south. It leaves the main road, following West Street, to the left near a Waitrose. It meets at busy traffic lights crossroads, which is the former Great North Road. It passes to the north of Stamford town centre, along North Street and East Street, which passes the and Stamford School. It briefly follows the trunk road A1175, then at a , follows the road to the left as Ryhall Road, with Stamford and Rutland Hospital to the right. Further north is the former site of the Mirrlees Blackstonediesel engine works, on the right hand side, now a retail park. From Stamford School, this is also part of the Macmillan Way. There is a junction with Drift Road to the left in the part of Stamford known as Northfields. At Borderville, it re-enters Rutland. There is a staggered junction for Little Casterton, and Belmesthorpe. It passes Ryhall, and crosses the River Gwash, which the road follows from Stamford. There is a cross roads where the road bends to the right, with junctions for Great Casterton and the B1176 to the north. It leaves Ryhall as Essendine Road, and crosses a 400 kV pylon line. It enters Essendine as Stamford Road, where it crosses the East Coast Main Line. As Bourne Road, it crosses the West Glen River. It Lincolnshire and South Kesteven of the Greatford junction. Nearby to the east is the former Stamford to Bourne railway, which the road follows from Stamford. It passes on the eastern edge of Carlby, and from near Carlby Hawes wood, is the parish boundary between Witham on the Hill and Toft with Lound and Manthorpe. There is a crossroads for Witham on the Hill, and Manthorpe. South of Toft it crosses the East Glen River. It passes the , and there is a left turn for Lound. There is a sharp bend to the left. Further north of Toft is a left turn for Lound. At Toft Lodge, it crosses over a of the former Melton Mowbray - Bourne railway. This is now Nature Reserve. North of here it enters Bourne, and further north is the junction with the A151, the of the road, east of Auster Wood.
