Smart finished second in the under-20 men’s race behind Devon team-mate Johnny Livingstone. He was also fourth overall in a joint race with the senior men.
He helped Devon easily win the inter-county under-20 event with three runners it the top three.
City of Plymouth’s Ben Harrison, running for Cornwall, came 11th under-20, with Erme Valley Harriers’ Jamie Frost, running in Devon colours, 14th.
City of Plymouth’s Barnaby Hutchings finished an impressive fourth for Cornwall in the under-13 boys’ event. He just missed out on silver by four seconds.
City of Plymouth’s Molly Shorey also claimed a top five finish in the under-15 girls’ event.
Shorey, who came fifth, was one of three Devon athletes to finish in the top five as they claimed the county team award.
But City of Plymouth claimed the club team prize, with four athletes in the top 20.
Holly Reid, running for Cornwall, was eighth, with club colleagues Molly Gilbey and Abbie Chapman, also representing Cornwall, 18th and 19th.
Armada athletes packed well in the under-15 girls’ race with Tavistock’s Lara Dix 23th, Erme Valley’s Bella May 24th and City of Plymouth’s Madeleine Jones 27th. They were all running for Devon.
There was a top 10 finish for Tavistock’s Fynn Baker as he helped Devon to team glory in the under-15 boys’ race, while Tavistock’s Ewan Dix (14th), Erme Valley’s Matthew Gilvear (16th) and City of Plymouth’s Thomas Jones (23th) were in the Devon under-17 team that came second.
Tavistock’s Charlotte Walker came 11th in the under-17 race, where City of Plymouth’s Martha Wilson also finished in the top 20, while Tavistock’s Tilly McDowell was 14th in the under-20 women’s category for Cornwall and Plymouth’s Kate Phillips was 17th for Devon.
Tavistock’s Nicki Kelly was 14th senior woman and came 20th overall in the joint junior and senior women’s race, while club colleague Anya McAulay and Erme Valley’s Isabella Trowell claimed top 20 finishes in the under-13 girls’ race as Devon claimed silver in the team competition.
In the non-championship under-11 girls’ race, City of Plymouth’s Elsie Goodspeed finished an impressive fourth.
Under-20 athlete Curtis clocked 7.28 seconds for the 60m flat and then ran 8.21 seconds to take second with the same time as Reading’s Sam Bell in the 60m hurdles.
That time meant Curtis ended 2021 ranked joint second in the UK under-20 60m hurdles rankings.
Clayden ran in the senior men’s hurdles and clocked a PB of 8.93 seconds. He also ran 7.30 seconds in the 60m flat.
At the same meeting, Plymouth’s Dan Newman clocked 1:25.93 to win his heat of the 600m, while fellow under-20 club team-mate Noah Jones jumped 3.65m in the pole vault.