While I don't have Chancellorsville, the rules on bridge repair state:
<blockquote id="quote"><font size="3" face="book antiqua" id="quote">quote:<hr height="1" noshade id="quote">Bridge Repair
By default, a bridge must have a nonzero strength before it can be crossed by units and any bridge that has been damaged cannot be repaired. When the optional Bridge Limit and Repair rule is in effect, there are two changes that occur.
The first change is that there are minimum strength values that the bridge must have to support movement depending on the type of unit. These values are based on the Maximum Bridge strength value determined by Parameter data.
• A bridge must have a strength of at least 1/4 the maximum to carry infantry units or dismounted leaders.
• A bridge must have a strength of at least 1/2 the maximum to carry cavalry units or mounted leaders.
• A bridge must have a strength of at least 3/4 the maximum to carry artillery or supply wagons.
For example, if the maximum bridge strength is 200, then a bridge must have a strength value of 50 to carry infantry or dismounted leaders, 100 to carry cavalry or mounted leaders, and 150 to carry artillery or supply wagons.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
So if a bridge's max strength is 500 (it can vary by scenario, and probably is a parameter data table setting), .75 of 500 = 375, you'd have to have bridges repaired to at least 375, but would probably want more if they'd be vulnerable to enemy artillery fire as they'd only be useable at 375 in your example.
1st LT Stephen Trauth
XVI Corps 1st Division 6th Brigade (divisional artillery)
AoT
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