Water-soaked counties in far southwest Iowa are seeing more floodwaters inundating highways, farmland and homes as heavy rains continue to fall.

Flood warnings were issued in Fremont and Mills counties through Thursday evening "or until the warning is canceled," according to the National Weather Service.

A recommended evacuation has been issued for residents in portions of Mills County near the Missouri River. Meanwhile, nearly 300 residents in the western portion of Fremont County have been under a mandatory evacuation for 75 days, when the river reached historic levels.

The Army Corps of Engineers is constructing a temporary floodwall using HESCO barriers on the southern end of Hamburg, Iowa, where a levee was overtopped in March.

"The Missouri River has not gotten out of flood stage since the beginning of this," said Mike Crecelius, Fremont County emergency management director.

Several feet of water remains over roads, in homes and in farmland in that corner of Iowa. More water continues to come through broken levees that have yet to be repaired since the flooding started in early March.

Water had slowly started to recede earlier this month, re-opening Highway 2 over the Missouri River into Nebraska City. That highway closed again Saturday evening due to water covering the road.

Drivers cannot access Interstate 29 anywhere in Fremont County. While I-29 remains open, all entrance and exit ramps are closed between Council Bluffs and Rock Port, Missouri. There are no services or fuel for approximately 70 miles, according to the Iowa Department of Transportation.

Crecelius expects other roads in his county, including Riverton Road, to close in the coming days.

Some homes that were dry after having been previously flooded are wet again, Crecelius said. Other homes that had stayed dry but were inaccessible may fall victim to floodwaters this round, he said.

"We have issues all over the county — again — right now," Crecelius said.

In Mills County, a handful of residents that had moved back in are now being advised to leave, said Sheri Bowen, public information officer for the county. Water has closed some county and gravel roads leading to and from those homes.

"It's significantly more water than we've had," she said. "It's coming through back into house yards (and) we'll have water in basements again."

No major highways in Mills County are closed, though Highway 34, which re-opened this weekend, was down to one lane as of Tuesday morning, Bowen said.

Ongoing flooding is occurring due to a number of levee breaches, as well as heavy rainfall. Fremont County has recorded almost 10 inches of rain to date in May as of 1 p.m. Tuesday, he said. More rain is forecast over the next several days.

There were more than 40 levee breaks in early March. Every levee between Council Bluffs and the Missouri state line remains compromised.

The Army Corps of Engineers has identified 19 breaches in Iowa that will get immediate repairs. But it will still take weeks and months until repairs are completed, with some not expected to be done until July. Other repairs could take years, the corps has said.

The corps plans to increase releases from Gavins Point Dam on the Missouri River in Yankton, South Dakota, due to heavy rain, leading to higher inflows into the water control system. Those releases take about three days to reach Fremont County.