We remained a Junior club for the best part of 70 years, during which time Shannon supplied numerous players to Garryowen's successful Senior sides. Shannon won the Munster Junior Cup for the first of many times in 1914. Our first Transfield cup was won in 1938. The following year, the Junior Cup was again annexed. One year later(1940), in the process of winning our first Charity Cup, we also added both the Munster Junior Cup and Transfield Cup.

Shannon's continued and consistent success as a Junior Club eventually led (some would say belatedly) to the club attaining Senior status in the 1953-54 season, becoming Limerick's fifth Senior club.

It was not until 1960 that Shannon won our first Munster Senior Cup, defeating UCC, 6pts to 3 in a pulsating replay at Thomond Park, having drawn 8-8 the previous week at Musgrave park in Cork.

Over the years, since the club's inception, Shannon have had numerous temporary grounds, among them the field at the Island Bank, Gilligan's field, Johnny Cusack's field and Egan's Field on the Mill Rd. in Corbally. The first purchased grounds were 14 acres of land at Fir Hill, Gortatogher, (better known as Athlunkard) just two miles from Limerick city. However, a few years ago, it was determined that this was not big enough, so it was sold to Corbally Utd. soccer club in favour of our current more spacious grounds at Coonagh off the Ennis Road. We currently have 3 training pitches there, floodlights and newly built dressing rooms, and are developing two more pitches.

While still a Junior Club, Shannon became co-tenants with Bohemians RFC at the Munster RFU-owned grounds at famed Thomond Park. In 1967, we completed our own Club Pavilion there. In 1978, the Pavilion was extended to the size it is today. There is talk currently of a further extension as the needs of a successful club in this professional age expand rapidly.