By Nicole Friedman 

NEW YORK--The benchmark U.S. oil price jumped to its largest one-day gain in nearly two months on Wednesday as traders seized on a sign that U.S. crude production could be nearing a peak.

The rate of U.S. crude-oil output fell last week for the first time since January, based on preliminary data, the U.S. Energy Information Administration said Wednesday.

Oil for May delivery soared after the morning report, closing at $50.09 a barrel on the New York Mercantile Exchange. That's up 5.2% on the day, the biggest percentage and dollar gain since Feb. 3.

Brent, the global benchmark, rose $1.99, or 3.6%, to $57.10 a barrel on ICE Futures Europe.

The decline could indicate that an oil glut, which sent prices to a six-year low earlier this year, is easing, some traders and analysts said.

Energy companies have announced billions of dollars of spending cuts, and for months have pulled back on the number of rigs used for drilling oil wells.

Investors, traders and analysts are closely watching for signs that these cutbacks in investments are leading to a slowdown--or even decline--in production, a process that usually takes months. New technology and efficiency gains have allowed producers to boost output by pumping more oil from existing wells, rather than drilling new ones.

U.S. oil output slipped by 0.4%, or 36,000 barrels a day, last week from multidecade highs the previous week, according to the EIA.

"Perhaps this is the first sign of a leveling off of oil production in the U.S.," said Andy Lipow, president of Lipow Oil Associates in Houston.

After plummeting in 2014, oil prices stabilized this year amid uncertainty about whether prices had hit bottom.

Ben Ross, co-portfolio manager for Cohen & Steers Inc., noted the drop but said he would wait to see a sustained decline in U.S. output before wagering on prices rising.

"Everybody's producing as much as they can right now," from U.S. firms to members of the Organization of the Petroleum Exporting Countries, Mr. Ross said. "I can't put too much credence into one weekly data point."

Mr. Ross, who helps oversee $443 million in commodity investments, has less money invested in oil than is recommended by the benchmark he tracks.

The weekly EIA data is often revised in monthly reports. In its latest monthly report released this week, the EIA reported that crude-oil production fell to 9.2 million barrels a day in January, from 9.3 million barrels a day in December.

"The market may be getting the sense now that we are seeing the effect of the decline in rig count and production figures," Mr. Lipow said. "It certainly may be the beginning of a trend."

A weaker dollar also boosted oil prices. Oil is traded in dollars and becomes cheaper for buyers using foreign currencies when the dollar weakens.

In addition, negotiations over Iran's nuclear program appear to have hit a roadblock, boosting the likelihood that sanctions limiting Iranian crude exports would remain in place.

Oil-market participants are keeping a close watch on the negotiations because a deal could lead to the lifting of international sanctions on Iran, paving the way for more Iranian crude to flood an already oversupplied global market.

Nuclear talks between Iran and six world powers missed the deadline for a preliminary agreement Tuesday, and negotiations stalled Wednesday. The deadline for a final nuclear deal to be reached is June 30.

"This market had quickly anticipated a successful outcome of the meetings," said Donald Morton, senior vice president at Herbert J. Sims & Co., who oversees an energy-trading desk. Traders who bet that a successful negotiation would push oil prices lower might have closed out those bets because of the uncertainty, he said. "Overrunning the deadline, I think, has got some people going from, 'We're going to have a successful outcome,' to more neutral."

Despite the drop in U.S. oil output and uncertainty about an Iran deal, some traders pointed to overall oil supplies in storage as a reason to remain bearish on oil. Crude-oil stockpiles rose for a 12th straight week to 471.4 million barrels, a record in weekly data, the U.S. Energy Information Administration said Wednesday.

Investors have become concerned in recent months about the rapid growth of U.S. crude-oil stockpiles, especially in Cushing, Okla., the delivery point for the benchmark Nymex contract. Cushing supplies rose by 2.6 million last week to 58.9 million barrels, the highest level on record, the EIA said.

If Cushing storage levels hit maximum capacity, that could weigh on prices as sellers cut prices to attract buyers with space left to store oil. The EIA said in September that Cushing's working capacity is 70.8 million barrels.

"We will be flush with storage--or actually, lack of storage" within weeks, said Harish Sundaresh, commodity strategist and portfolio manager for Loomis, Sayles & Co., which manages about $230 billion, at a media event Wednesday. "Storage operators can actually charge a lot more to store a barrel." Mr. Sundaresh expects oil prices to fall as sellers compete for buyers who are facing higher storage costs.

Gasoline stockpiles fell by 4.3 million barrels to 229.1 million barrels, the lowest level this year. Analysts had predicted on average that inventories would fall by 900,000 barrels. Gasoline futures settled up 3.5% at $1.8312 a gallon.

Distillate stocks, which include heating oil and diesel fuel, rose by 1.3 million barrels. Analysts had expected a 300,000-barrel weekly decrease.

Diesel futures rose 2.3% at $1.7469 a gallon.

Write to Nicole Friedman at nicole.friedman@wsj.com

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