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The highway is scheduled to be closed for parts of Tuesday, Wednesday and Thursday between Jamison Creek Road and an area near Acorn Drive near Forest Springs, according to Caltrans.
About half of the northbound lane on the highway was damaged March 4 when the soil beneath the roadway gave way.
The road will be closed while crews drill three holes to obtain geotechnical design information necessary to build a retaining wall, according to Caltrans.
The crews will drill the first hole on Tuesday and use one-way traffic control on the highway.
Authorities will close the entire highway from 9 a.m. to 6 p.m. on Wednesday while they drill the second hole, according to Caltrans, which will continue the full highway closure Thursday as well if the second hole is not completed.
The drilling of the third hole on Thursday will only necessitate one-way traffic control, according to Caltrans.
Electronic message signs will be posted on Highway 236 and state Highway 9 to advise motorists of the current traffic condition and any detours necessary due to the closures.
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