HONOLULU (HawaiiNewsNow) - Oahu didn't get a direct hit from Tropical Storm Olivia, but it did get a serious soaking.
Several weather alerts were posted for the island late Wednesday into Thursday morning, and all that heavy rain caused a big mess mess for residents and commuters, leading to road closures, power outages and a huge sewage spill.
It also quickly filled Nuuanu reservoir no. 1, leading to concerns that the dam could top its banks and force thousands to evacuate.
Crews worked quickly to pump water from the dam so that no evacuations were needed.
But the incident underscored the volume of rain that fell on Oahu as Olivia passed by.
The National Weather Service said that in the 48 hours that ended at 6 a.m. Thursday, Lyon Arboretum in Manoa saw more than 10 inches of rain while Upper Nuuanu got more than 7 inches.
The torrential rain caused ponding on major roads across the island, and even prompted officials to close off Hawaii Kai-bound lanes of Kalanianaole Highway near the Makapuu Lighthouse on Thursday morning.
Flooding also closed both directions of Kamehameha Highway between Waikane Valley Road and Waiahole Valley Road around 9:45 a.m.
Meanwhile, heavy downpours through the night triggered a massive sewage spill in Kalihi.
According to the city Department of Environmental Services, some 32,400 gallons of raw wastewater spilled at North School Street. Most of that went into a storm drain that empties into the Kapalama Stream and eventually to Honolulu Harbor.
Approximately 775 gallons have been recovered so far.
Also Thursday, thousands of customers — specifically in Aina Haina in Kaaawa — experienced power outages.
The problems all happened a day after Olivia passed Maui and Lanai, triggering widespread flooding.
On Wednesday, officials warned that moisture associated with Olivia could stick around for several days.
Oahu started to see heavy rains from Olivia on Wednesday.
Through the day, there were a number of reports of downed trees, including on Kamehameha Highway in Sunset Beach, on Diamond Head Road and Likelike Highway. About noon, officials said one Kaneohe-bound lane of the highway was closed near the tunnels as crews cleared the tree.
There were also a number of large power outages, which affected thousands from east Honolulu to the North Shore.
Blustery conditions were seen islandwide, and some spots saw wind gusts to 41 mph.
This story will be updated.