Beginning on April 6th and continuing through April 10th a series of Pacific atmospheric rivers were directed into Oregon, southeast Washington and central Idaho saturating the ground with heavy rainfall. During this 4 day period the COOP station at Kamiah reported 1.86 inches of rain, Elk River reported 2.94 inches of rain, Moscow 3.44 inches, Nez Perce 2.05 inches, Potlatch 2.46 inches, Dworshack Fish Hatchery 3.08 inches , the Lewiston Airport ASOS 0.93 inches and the ASOS at Pullman, WA recording 2.88 inches of rain. By the 9th of April widespread areal flooding issues from swollen streams and rivers as well as mud slides were noted around the region which persisted until the 11th when heavy rain ceased and rivers and streams began to recede.
Kamiah, ID suffered minor flooding of businesses, utilities and park land from the Clearwater River on the eastern boundary of the city and and the breaching of a levee on Lawyer Creek on the southern edge of the city. Lapwai Creek also overflowed it's banks threatening homes and flooding bottom lands and portions of State Highway 95 between Lapwai and Culdesac. Tribal officials of the Nez Perce reservation, which includes most of this region, declared a State of Emergency in response to this flooding event.
In the city of Moscow after receiving 1.47 inches of rain on April 9th, Paradise Creek rose to it's highest flood level on record causing extensive minor flooding of portions downtown Moscow. This flooding was aggravated by a Flash Flood running through residential neighborhoods and business districts laying in in gullies and ravines draining the saturated hills to the north of the city
The Palouse River also reached flood stage with inundation of bottom lands and fields along the river with some minor flooding of agricultural out buildings.

Debris Flow in LEWIS, IDAHO
From 09-APR-19 04:00:00 to 09-APR-19 11:00:00 (PST-8)
Location: KAMIAH
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several mud slides were reported over Highway 12 just west of Kamiah on the morning of April 9th. One of the slides completely covered the road and caused the temporary closure of this primary road through the region while crews cleared the debris.

Flood in LEWIS, IDAHO
From 09-APR-19 04:30:00 to 11-APR-19 08:00:00 (PST-8)
Location: KAMIAH
Flood cause: Dam / Levee Break
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High water in the Clearwater River augmented by a levee break along Lawyer Creek  produced extensive flooding near the confluence of these two streams on the eastern edge of the city of Kamiah. The flood waters were reported to be waist deep in the Kamiah Riverfront Park. Flood waters also partially inundated a lumber yard, undermined a railroad grade and trestle crossing Lawyer Creek and high water prohibited access to the city's water plant. The levee was temporarily repaired by the public works department as the creek receded.

Flood in NEZ PERCE, IDAHO
From 09-APR-19 07:00:00 to 10-APR-19 11:00:00 (PST-8)
Location: LAPWAI
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Tribal Official

Lapwai Creek flooded bottom lands and flowed over Highway 95 in places between Lapwai and Culdesac causing the temporary closure of this primary route through the region. A few homes were threatened by the flood waters but no damage to any structures was reported.

Flash Flood in LATAH, IDAHO
From 09-APR-19 15:30:00 to 09-APR-19 21:30:00 (PST-8)
Location: MOSCOW
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain during the afternoon and evening of April 9th caused Paradise Creek running through Moscow to rapidly rise and inundate lower elevation portions of the city along the creek.  In addition heavy rain in the hills north of Moscow caused flash flooding in the northeastern areas of the city as runoff drained through valleys and ravines along North Polk Street and into the East D street neighborhood, then through downtown before  draining into Paradise Creek.  In some areas flood waters were reported to be 3 feet deep with numerous roads, intersections and underpasses impassable. Most of the reported damage involved basement and first floor flooding of buildings.

Flood in LATAH, IDAHO
From 09-APR-19 14:45:00 to 10-APR-19 02:00:00 (PST-8)
Location: MOSCOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS River Gage on Paradise Creek in Moscow recorded a sharp rise to above the Flood Stage of 9.2 feet at 2:45 PM PDT on April 9th. The creek continued to rise passing through the Moderate Flood Stage of 10.0 feet at 7:00 PM. The creek continued to rise and crested at 11.4 feet at 7:15 PM which is a record high crest beating the previous record crest of 11.3 feet set in 1996. The creek then quickly receded passing below the moderate Flood Stage at 8:00 PM and then below Flood Stage at 9:15 PM PDT.

Flood in LATAH, IDAHO
From 09-APR-19 19:30:00 to 10-APR-19 20:15:00 (PST-8)
Location: KENNEDY FORD
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS River Gage on the Palouse River near Potlatch recorded a rise to the Flood Stage of 15.0 feet at 8:30 PM PDT on April 9th. The river continued to rise and pass through the Moderate Flood Stage of 16.0 feet at 10:45 pm on the 9th. The river crested just under the Major Flood Stage of 17.0 feet at 5:00 am on the 10th and then began receding. The river passed down through the Moderate Flood Stage at 3:00 PM on the 10th and then receded below the Flood Stage at 9:15 PM PDT on April 10th.