( CNN ) -- Two Missouri River levees broke Monday along the swollen Missouri River near the Iowa-Missouri border , a local official and the U.S. Army Corps of Engineers said . The first breach , which was some 300 feet wide and growing , was a `` full breach , '' the Army Corps of Engineers said in a statement . The break was in Atchison County , Missouri , just south of Hamburg , Iowa , it said . The National Weather Service warned that flooding could affect Interstate 29 and the town of Hamburg . `` The concern is that anybody ... near the river would see some floodwaters that could impact either their road or homes , '' said David Pearson with the National Weather Service in Omaha , Nebraska . The second breach was located just south of Atchison , in Holt County , Missouri , said Holt County clerk Kathy Kunkel . She said flooding was affecting farmland . A breach earlier this month prompted the evacuation of hundreds of people in the Hamburg area as a precaution . No evacuations were immediately recommended or ordered as a result of Monday 's breaches , officials said . However , `` people 's safety is our number one concern , so we want to stress how important it is for the public to stay off these levees as we continue to assess the risk , '' said Omaha Corps District Commander Col. Bob Ruch . The breach near Hamburg was deemed too substantial to repair , said Pearson . `` The next step is to attempt to mitigate the flooding with another levee between the one that failed and Hamburg . '' State and local emergency management officials were notified , the corps said , and were working with the corps , the National Weather Service and the Federal Emergency Management Agency . It was too early to determine the cause of the breach near Hamburg , the corps said . But it follows weeks of high flows and record releases from dams in Montana and the Dakotas . Heavy rains and snowpack runoff could result in near-record flooding along parts of the Missouri this year , officials have said . This year 's flooding is putting levees to the test along much of the 1,700 miles of the Missouri . Temporary levees are being built in several locations . CNN Radio 's Paul Chambers contributed to this report .
NEW : A first breach occurs in Hamburg , Missouri . NEW : Earlier , a levee broke in Atchison County , Missouri . The flooding could affect the town of Hamburg , Holt County . Missouri River could see near-record flooding Monday .