Bridgewater will play Wedderburn Band in the Upper Loddon Cricket Association grand final.
Bridgewater qualified for the decider by scoring a six-wicket win over Arnold, while Wedderburn Band upset minor premier Kingower in other semi-final.
A great spell of bowling from Justin Hargreaves was the catalyst for Wedderburn Band's win.
Hargreaves took 4-25, including the prized wicket of Kingwower skipper Braydon Welsh for 12.
Lachlan Peters chipped in with 3-18 as Wedderburn restricted the powerful Kingower line-up to 9-111 from 40 overs.
On a day when most batsman struggled, Wedderburn opening batsman Bradley Holt produced a brilliant innings.
While the rest of his top-order fell around him, Holt made a fine 73 not out to guide his team home by four wickets.
Bridgewater hadn't beaten Arnold in three previous attempts this season, but in the match that mattered the home side got the job done.
After winning the toss and batting, Arnold battled to reach 7-90 off 40 overs.
Opener Phil Scholes made 39 and the next best total was extras on 18. No other batsman made more than nine.
All six Bridgewater bowlers did their job, with Lachlan Ross (2-19) the most successful.
Bridgewater still had 10 overs and six wickets to spare when the winning runs were hit.
Jayden Burke led the way with 27, while Oscar McKinley finished 19 not out.
Read more: Wrap of the final round of the BDCA
Read more: Crows, Creek cruise in EVCA
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