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Wireless monitoring systems are increasingly being used in structural health monitoring for its benefits of good economy and ease of maintenance. However, the energy limited of wireless sensor nodes is a major problem for wireless monitoring systems. In this paper, a low-power routing protocol is proposed for the wireless bridge health monitoring system, and the protocol has a good effect on extending the network lifetime. Simulation results show that the protocol balances the network energy consumption, and extends the network lifetime by 30% or more compared with Leach and GAF.